IN THE MATTER OF: ILLINOIS POLLUTION CONTROL BOARD July 25, 2013 ) ) Rl3-ll IEPA ATTACHMENT NO.

# _!l_

NATIONALAMBIENT AIR QUALITY STANDARDS, USEPA REGULATIONS (through December 31, 2012) ) (Identical-in-Substance Rulemaking- Air) ) Adopted Rule. Final Order.
OPINION AND ORDEROF THE BOARD (byJ.A. Burke):
This rulemaking updates the ambient air quality standards in the Board's airpollution regulations (35 Ill. Adm. Code 243) to make them confom1 withNational Ambient Air Quality Standards (NAAQS) 1 adopted by the United States Environmental Protection Agency (USEPA) pursuant to section 109 ofthe CleanAirAct (CAA) (42 U.S.C. § 7409 (2011)). This is the initial proceedingunder a new identical-in-substancemandate adopted in P.A. 97-945 (eff. Aug. 10, 2012) to ensure that Illinois' regulations reflect USEPA's most recent NAAQS. Todaythe Board adopts amendments thatreplace all existing Illinois ambient air quality standards with standards de1ived directly from the federal NAAQS codified in40 C.F.R. 50. As explainedbelow, the Board intends the Illinois ambient air quality standards adopted inthis proceeding to be identical-in-substance with their federal counterpm1s, as "identical-insubstaJ1ce" is defined by Section 7.2(a) ofthe EnvironmentalProtectionAct (Act) (415 ILCS 5/7.2(a) (2012)).
Section 1 O(H) ofthe Act ( 415 ILCS 511O(H), as addedbyP.A. 97-945 (eff. Aug. 10, 2012)), mandates this rulemaking requiring the Boardto "adopt ambient air quality standards specifYingthe maximum pe1missible shm1-term a11d long-te1m concentrations ofvarious contaminants inthe atmosphere; those standards shall be identical in substance to the national aJnbient air quality sta11dards promulgatedby

... the United States Environmental Protection Agencyin accordance with Section 109 ofthe CleanAirAct [(42 U.S.C. § 7409)]." 415 ILCS 5/lO(H).
Section IO(H) ofthe Act (415 ILCS 5/lO(H) (2012)) and Section l-5(c)(l) ofthe AdministrativeProcedureAct (APA) (5 ILCS 100/5-l-5(c)(l) (2012)) also providethat Title VII ofthe Act a11d Section 5-35 ofthe APA (5 ILCS 100/5-35 (2012)) do not apply to this proceeding. Accordingly, the Board did not adopt a "FirstNotice" proposal and a "Second Notice" proposal for reviewbytheJoint Committee on Administrative Rules (JCAR). However, as provided in Section IO(H) ofthe Act, a11d as explainedin the two following segments ofthis opinion a11d order, the Board, before adopting final rule amendments, providednotice ofthe May 16, 2013 rulemaking proposal in the May 31, 2013 issue oftheIllinois Register, held onepublic hearing ontheproposal onJune 26, 2013 in Springfield, as required bythe federal Clean AirAct

1Throughout this opinion and inthe regulatory text, the Boarduses the abbreviation "NAAQS" to refer to a single standard and "NAAQS" to refer to multiple sta11dards.(33 U.S.C. § 7410(a) (2011)), and allowed for public comment for 45 days afterpublication of theIllinois Register notices, until July 15, 2013.
The Board reserved this docket to accommoda,te the initial set ofamendments necessary to conformthe Illinois ambient air quality standards to the federal NAAQS, as adopted and amendedbyUSEPA through December 31, 2012. Board action was necessaryto amend the Illinois ambient air quality standards to conformwith theNAAQS adopted by USEPA, as amended through calendar year 2012.
The Board prefaces this opinion withprocedural matters. The substantive discussions follow the procedural matters.
PUBLIC COMMENTS
The Board adopted a proposal for public comment inthis matter on May 16, 2013. A Notice ofProposed Amendments appeared in the May 31,2013 issue oftheIllinois Register, at 37 Ill. Reg. 7316. The Board invited public comment ontheproposed amendments. The Board received public comments onthatproposal for 45 days after that date ofpublication, until July 15, 2013. During thepublic comment period, the Board received comments from the Illinois Environmental Regulatory Group (IERG):
PC I FirstNotice Comments ofIERG,byAlec M. Davis, General Counsel (dated July 15, 2013) ByPC I, IERG supported the approach taken bythe Board inthe May 16,2013 proposal for public comment. IERG maintains inPC I that the Boardmisapprehended that an area designation underthe 2008 eight-hourNAAQS for ozone would effectthe sunset ofthe 1979 one-hour ozone standard. IERG explainedthat USEPA's June 15, 2004 area designations under the 1997 eight-hourNAAQS for ozone wasthetriggering event. TheBoard has corrected the text ofthe adopted rules by removing the 1979 one-hour standard, as is discussed in the appropriate segment ofthe following discussions.
FEDERALLY REOUIRED PUBLIC HEARING
The Board expects that the Illinois Environmental ProtectionAgency (Agency) will submitthepresent amendments as a revision to the Illinois State ImplementationPlan (SIP) for various contaminantspursuant to section 110 ofthe federal CleanAirAct (42 U.S.C. 

### § 7410(a) (2011) and the implementing USEPAregulations. See 40 C.F.R. 51.102 and appendix V (2012).
The Board held a public hearing in Springfield on June 26, 2013 in this mlemaking for thepurpose ofallowing interested members ofthepublic to comment ontheproposed amendments and the anticipated SIP revision that will result from their adoption. The Agency and the Illinois Environmental Regulatory Group (IERG) appeared at the hearing, and Mr. David Kolaz, fmmerly Chiefofthe Agency's BureauofAir, presentedtestimony on behalfofIERG. Mr. Kolaz testified that the Board misapprehended that an area designationunderthe 2008 eighthourNAAQS for ozone would effect the sunset ofthe 1979 one-hour ozone standard. Mr. Kolaz

### asserted that it was the June 15, 2004 USEPA area designations under the 1997 eight-hour NAAQS for ozone that caused the sunset ofthe 1979 NAAQS. The Board has corrected the text ofthe adopted mles by removing the 1979 one-hour standard, as is discussed in the appropliate segment ofthe following discussions.
DUE DATE AND SCHEDULE FOR COMPLETION


### The Board must complete action to adopt amendments within one year ofthe date when USEPA has revised theNAAQS. 415 ILCS 5/7.2(b). Since USEPA adopted all ofthe federal NAAQS more than one year before the effective date ofP.A. 97-945, the Board is interpreting that this initial round ofamendments must be completed before August 10, 2013. Fulfilling the one-year mandate before that date will require proceeding according to the following schedule:
Due date: Proposal adopted date: Illinois Register

### publication date: Public hearing date: End of45-daypublic comment period: Adoption date: 

### Possible filing and effective date: 

### PossibleIllinois Register

### publication date: August 10, 2013 May 16,2013 

### May 31,2013 June 26, 2013 July 15,2013 July 25, 2013 August 5, 2013 

### August 15, 2013
OVERVIEW OF THE FEDERAL NAAQS AND THIS PROCEEDING


### The amendments adopted today are intended to make the Illinois ambient air quality standards identical-in-substance to the NAAQS adopted by USEPA. Today's amendments include USEPA revisions and ancillary actions, such as USEPA approvals ofreference methods and equivalent methods, through December 31,2012. The following table outlines the discussions and acts as a table ofcontents: Topical Heading Page The Context ofThis Identical-in-Substance Proceeding 6 Overview ofthe Federal NAAQS 6 The Section lO(H) Mandate and the Federal Regulations Included 7 Replacing the Existing Illinois Ambient Air Quality Standards 7 Retaining the Existing Illinois Stmcture: Combining a Critelia 8 Pollutant Use ofthe Singular orPlural to Refer to Plimary and Secondary 9 NAAQS Standardized Naming ofEachNAAQS 9Removal ofTwo Illinois Rules 11 Removal ofthe "Nondegradation" Rule 11 Removal ofthe "Monitoring" Rule 12 Inclusion ofPrescribed Methods, Required Interpretations, and Special- 13 Case Methods List ofDesignated Methods 13 Incorporation ofDesignated Methods 14 References to Methods inthe Text ofthe NAAQS 14 Standardization ofTe1ms: FRMs, FEMs, and List ofDesignated 15 Methods Codified and Non-Codified FRMs 15 Non-Codified FEMs 17 The Difference Between FRMs and FEMs 17 Interpretations: Conventions for DataManagement and Analysis 19 The Special Case FRMs ofAppendices B, 0, and Q 20 Appendix B: FRM for Total Suspended Particulate Matter 20 Appendix 0: FRM for Coarse Pmticulate Matter (PM10•2.5) Appendix Q: FRMfor Lead inParticulate Matter (PM10) 20 21 SummaryTabulation ofthe NAAQS and Supporting Appendices 22 NAAQS for Sulfur Oxides 22 NAAQS for PM 10 and PM2
.5 22 NAAQS for CarbonMonoxide 23 NAAQS for Ozone 23 NAAQS for Nitrogen Oxides 24 NAAQS for Lead 24 Non-NAAQS Required Monitoring 25 Summaryre Inc01poration ofthe FRMs, FEMs, and Inte1pretations 25 Codified FRMs 25 Non-Codified FRMs 25 Non-Codified FEMs 25 Intmpretations 26 The Special-Case FRMs 26 Omission ofAncillary Federal Regulations in 40 C.F.R. 53, 58, and 81 26

### Revisions to USEPA Defmitions/Definitions Added 27 Shifted Meanings and Revisions to the Preamble 27 Changes in Defmed Terms 28 Added Defmed Terms 28 Omitted Defmed Terms 29 USEPA Rules Added/State Provisions Removed 29 Incmporation ofthe NAAQS for the Six Criteria Pollutants 31 Section 243.120: Particulate Matter 32 Section 243.122: Sulfur Oxides 36 Sunset Clause for the 1971 Primary 24-HourNAAQS for Sulfur 38 Oxides Option 1: Retain the Entire Federal Text with Minimal Deviation 39 Option 2: Replace the Statement ofInapplicability and Delete One 40 Exception Statement. Option 3: Replace the Statement ofInapplicability with a Statement 41 That the Board Will Remove the 1971 NAAQS When Conditions Are Fulfilled Option 4: Replace the Statement ofInapplicability with a Statement 41 That the Board Will Remove the 1971 NAAQS When USEPA Makes Area Designations Under the 2010 One HourNAAQS or Removes the 1971 NAAQS Option 5: Remove the Sunset Provision in 

### Its Entirety 42 Selection ofOption 3 42 Section 243.123: Carbon Monoxide 42 Section 243.124: Nitrogen Oxides 44 Section 243.125: Ozone 46 Sunset ofthe 1979 Primary and Secondary One-HourNAAQS for 48 Ozone Partial Sunset ofthe 1997 Primary and Secondary Eight-Hour 49 NAAQS for Ozone Section 243.126: Lead 49 1978 Primary Calendar QuarterlyAverage NAAQS for Lead 50 Non-Inclusion ofthe 2012 NAAQS for PM2
.5 

### and dPM 10 

### 51 Responses to Requests for Public Comments 53 Deviations from the Literal Text ofthe Federal Amendments and Non- 55 Federally Derived Conections and ClarificationsTabulations ofDeviations from the Literal Text ofthe Federal Amendments 56 and Miscellaneous Board Housekeeping Amendments Table I: Deviations from the Text ofthe Federal Rules Table 2: Board Housekeeping Amendments ORDER (Text ofthe Amendments)

The Context ofThis Identical-in-Substance Proceeding 56 91 94

The Board does not engage in substantive review offederal standards inthe context ofan identical-in-substance proceeding. Rather, the Boardreviews federal standards onlyto the extent necessaryto make a "best fit" for those standards inthe context ofthe Illinois regulatory scheme.
The Board tries to follow the structure and content offederal regulations where possible. This ensures the full incorporation ofall necessary elements ofthe presentfederal standards, and it makes updating the regulations easier when future federal amendments occur. Depa11ures from the federal structure may occur for a valiety ofreasons and will be noted
as neededbelow. Where more stlingentpre-existing State standards exist that will continue in effect after incorporation offederal elements, the Board will incorporate a structure that retains those State standards. See, e.g., RCRA SubtitleD Amendments (Amendments to 35 Ill. Adm. Code 810. 811. and 814). R93-10 (Sept. 15, 1993), slip op. at 3-5 (adding required federal elements into existing Stateregulations); Safe DrinkingWaterAct Regulations, R88-26 (Aug. 9, 1990), slip op. at 6-7 (retaining more stlingentpre-existing Stateregulations withinthe body of new federal requirements).
Overview ofthe Federal NAAOS
The federal CAA requires USEPA to assemble a list ofairpollutants that "cause or contlibute to air pollution which mayreasonably be anticipated to endangerpublic health or welfare." 42 U.S.C. § 4208(a)(l) (2011). Thepurpose is to establish national primary and secondaryNAAQS. A p1imaryNAAQS is intendedto protectpublic health, and a secondary NAAQS is intended to protectpublic welfare. 42 U.S.C. § 4209(b) (2011). USEPA is required to periodicallyreview eachNAAQS and revise it where USEPA determines that revision is necessary. USEPA is further required to establish an independent technical advisory committee to aid theperiodic reviews ofeachNAAQS. 42 U.S.C. 

### § 4209(d) (2011).

To date, USEPA has designated six "criteria" pollutants for establishment ofprimary and secondaryNAAQS:
Carbonmonoxide (CO) (see 40 C.F.R. 50.8 (2012)); Lead (Ph) (see 40 C.F.R. 50.12 and 50.16 (2012)); Nitrogen oxides (NOx) (see 40 C.F.R. 50.11 (2012)); Ozone (03) (see 40 C.F.R. 50.9 and 50.15 (2012)); Particulate matter (PM) in various, evolving, standards: Pa11iculate matter (PM) (see 40 C.F.R. 50.6 (1986));Pru1iculate matterwith an aerodynamic diameter of 10 micrometers (}lm) orless (PM 10) (see 40 C.P.R. 50.6 (2012)); and Particulatematter with an aerodynamic diameter of2.5 micrometers (11m) or less (PM2

### .s) (see 40 C.P.R. 50.7 (2012)); and Sulfur oxides (as sulfur dioxide) (S02) (see 40 C.P.R. 50.4, 50.8, and 50.17 (2012)).
The Section IO(H) Mandate and the Federal Regulations Included ByP.A. 97-945, the General Assemblyhas created a new identical-in-substance mlemaking subject matter. 2 Effective August 10,2012, the General Assemblyrevised 415 ILCS 5/7.2 and 10 to require the Board to adopt rules that are identical-in-substanceto regulations adoptedbyUSEPApursuant to 42 U.S.C. § 4209. Those federal regulations are the federal NAAQS codified as 40 C.P.R. 50. Thus, 40 C.P.R. 50 is theprincipal focus ofthis proceeding. The Board, however, must consider exactlywhich segments of40 C.P.R. 50 are required and whether segments ofother federal regulations are necessaryto fully incorporate the federal NAAQS into the Illinois air regulations.
The federal NAAQS in 40 C.P.R. 50 rely on at least three other segments ofUSEPA regulations. The first segment ofUSEPAregulations relates to USEPA-approved monit01ing and testing methodsrequired for demonstrating compliance. See, e.g., 40 C.P.R. 50.4(c), 50.5(b), and 50.17( c) (2012) (specifying the methods for the NAAQS for sulfur dioxide). The second segment is the body ofmles that prescribe therequirements for assembling, maintaining, and operating an ambient airmonitoring network-i.e., presc1ibing when, where, and how to use therequired monitoring and testing methods. See 40 C.P.R. 58 (2012). Thethird segmentis the series ofUSEPA area designations, which defme the monitoring areas within each state, and which classifythe attainment ornon-attainment status ofeach air monit01ing area for each criteriapollutant. See 40 C.P.R. 81 (2012). The applicability ofmany olderNAAQS is determined byreliance on those area designations. See, e.g., 40 C.P.R. 50.4(e), 50.9(b), and 50.12(b) (2012) (co!Tesponding with 35 Ill. Adm. Code 243.122(a)(5), the 1971 primary NAAQS for sulfur oxides; 243.125(a)(2), the 1997 one-hourprimary and secondaryNAAQS for 0 3; and 243.126(a)(2), the 1978 p1imruy and secondaryNAAQS for lead, respectively). Replacing the Existing Illinois Ambient Air Qualitv Standards
Inthe context ofthis proceeding, pre-existing State ambient air quality standards exist in 35 Ill. Adm. Code 243. The Board intended that those standards be consistent with co!Tesponding federal NAAQS. See Proposed Air Quality Standards, R72-7 (July 10, 1975), slip op. at 4-5, 14 (initial Board adoption ofambient air quality standards). The Board intended no more stringent State standard inthe Illinois ambient air qualityregulations. See !d. at 4-5 (observing adoption ofthe federal standards absent a reason to differ).

2 The statedpwpose was to facilitate adoption ofthe federal NAAQS and the airpe1mitting process in Illinois. See 97th Ill. Gen. Assem., Senate Proceedings, March 29, 2012, at 28; 97th Ill. Gen. Assem., House Proceedings, May 25,2012, at 27.Over time, the Illinois ambient air quality standards lagged behind adoption ofthe federal NAAQS. See Air Quality Standards Clean-Up: Amendments to 35 Ill. Adm. Code 217. 233. and 243, R09-19 (Sept. 22, 2011) (SecondNotice opinion and order), slip op. at 4-8, 16; see also Air Quality Standards Clean-Up: Amendments to 35 Ill. Adm. Code 217. 233. and 243, R09-19 (Oct. 20, 20II), slip op. at 4-7 (adopted mle opinion and order). Thus, the existing Illinois NAAQS do not presently include any Staterequirements that are more stringent than the federal NAAQS, and they do not include all ofthe cunent federal NAAQS.
The mandate ofSection IO(H) ofthe Act (415 ILCS 5/IO(H) (2012)) arose in this context. The mandate requires that the Board adopt standards that are identical-in-substance to the federal NAAQS. The mandate fmther allows the Board to adopt more stringent State standards by generalmlemaking. See 415 ILCS 5/IO(H) (2012).
The Act generallyrequires that identical-in-substance mles closely follow the language and stmcture ofthe corr-esponding federal regulations. See 415 ILCS 5/7.2(a) (2012). The Board, however, routinely uses the limited flexibility in the statutory definition of"identical in substance" (see 415 ILCS 5/7.2(a) (2102)) to preserve more stringent existing State standards. See, e.g., RCRA SubtitleD Amendments (Amendments to 35 Ill. Adm. Code 810. 811. and 814), R93-IO (Sept. 15, 1993); Safe Drinking WaterActRegulations, R88-26 (Aug. 9, 1990), at 6-7; Pretreatment Regulations, R86-44 (Dec. 3, 1987), at 7, 12, 23.
Sincethere are no existing Illinois ambient air quality standards that are more stringent than the federal NAAQS, the Board has little reason for significant deviation from the stmcture and language ofeach federal NAAQS. Further, retaining the structure and language ofthe individual NAAQS will facilitate future updates to the Illinois regulations as the federal NAAQS continue to evolve. The Boardhas replaced the structure and language ofthe existing Illinois ambient air quality standards withthat ofthe federal NAAQS.
Forthe foregoing reasons, the Board has opted to replace the existing Illinois ambient air quality standards with the federal NAAQS. The new language is drawn directly from 40 C.F.R. 50, retaining the structure and language ofthe federalmles. There are deviations discussed throughout this opinion and order. The Boardnotes tlrree ofthe exceptions here. Retaining the Existing Illinois Structure: Combining All NAAQS for a Criteria Pollutant. The Boardhas combined the multipleNAAQS for each crite1ia pollutant into a single provision. Thus, the primary and secondaryNAAQS for 

### PMw and PM2
.5from 40 C.F.R. 50.6, 50.7, and 50.13 are combined in Section 243.120; the NAAQS for sulfuroxides from 40 C.F.R. 50.4, 50.5, and 50.17 are combined in Section 243.122; and theNAAQS for ozone from 40 C.F.R. 50.9, 50.10, and 50.15 are combined in Section 243.125; and theNAAQS for lead from 40 C.F.R. 50.12 and 50.16 are combined in Section 243.126. USEPA itselfcombined the NAAQS for nitrogen oxides into a single provision, in 40 C.F.R. 50.11 (corr-esponding with 35 Ill. Adm. Code 243.124). There is no need to combine standards as to the federal NAAQS for carbon monoxide, as there is only one federal standard, in40 C.F.R. 50.8 (corr-esponding with 35 Ill. Adm. Code 243.123).Use ofthe Singular or Plural to Refer to Primarv and Secondarv NAAQS. USEPA oftenuses the plural to refer to primary and secondaryNAAQS where both are embodied in a single standard. See, e.g., 40 C.P.R. 50.6(a) (1987 primary and secondary 24-hourNAAQS for PMw) and 50.9(a) (1997 primary and secondary one-hourNAAQS for ozone). The Board has consistently used the singular to refer to NAAQS that embody the primary standard and the secondary standard in a single number, which the Board perceives as a single primary and secondary standard. See, e.g., 35 Ill. Adm. Code 243.120(a)(I) and 243.125(a)(l) (con·esponding with the above-cited federal NAAQS). On the other hand, the Board has used the plural where two separate numerical standards are presented. For example, theprovision that recites the 2010 NAAQS for nitrogen oxides includes a one-hour primaryNAAQS and an annual average secondaryNAAQS. See 40 C.P.R. 50.11 (b) and (c) (2012). See 35 Ill. Adm. Code 243.124(b) and (c) (corresponding with 40 C.P.R. 50.ll(b) and (c) (2012)). As another example, the provision relative to the 1971 eight-hour and one-hourprimaryNAAQS for carbon monoxide recites an eight-hour average concentration and a separate one-hour average concentration. See 40 C.P.R. 50.8(a)(l) and (a)(2) (2012).
Standardized Naming ofEach NAAQS. To accommodate the combined structure and clarifythe rules, the Board has standardized the names for eachNAAQS. The Boardstandardized names indicate the year that USEPA adopted each standard. Eachname indicates whetherthe standard is a primary standard, a secondary standard, orprimary and secondary standard. Each name indicates the duration ofeachreported monitoring result-"annual averaoe" Hqum1erly averaoe" (or "three-month averaoe") "24-hour" "eio-ht-hour" "three-hour" 0' 0 0 ' ' 0 ' ' or "one-hour."3 Each ofthe standardized names states "NAAQS" followed bythe name ofthe particular criteria pollutant-i.e., "carbon monoxide," "lead," :nitrogen oxides," "ozone," "PMw" or "PM2.s," or "sulfuroxides." These standardized names are rigidly applied throughout the text ofthe rules, and they are consistently used throughout this opinion. Thus, each standardized name for the NAAQS is stmctured as follows:
[Year] "primary" and/or "secondary" [monitoring period] "NAAQS for" [pollutant name]

Each federal NAAQS is discussed below, including consideration ofdevelopment ofthe standard. That discussion ofthe individual NAAQS, organized on apriority pollutant-bypriority pollutant basis, explains the Board's selection ofeach standardized name.

3 The monitoring for eachNAAQS occurs over specific periods, the monitoring results are analyzed in specific ways, and the results are reported in a time-period-analyzed basis. Thus, some ofthe NAAQS are reported and considered on a quruterly or annual-average basis. See, e.g., 40 C.P.R. 50.4(a) (1971 primary annual averageNAAQS for sulfur oxides) and 50.12(a) (2008 primary and secondarythree-month averageNAAQS for lead). Some are reported on a shmt-te1mbasis ofa one-, three-, eight-, or24-hour average. See, e.g., 40 C.P.R. 50.4(a) (1971 primary 24-hourNAAQS for sulfur oxides), 50.5(a) (1971 secondarythree-hourNAAQS for sulfur oxides), 50.8(a) (1971 primary eight-hourNAAQS for carbon monoxide), and 50.13(a) (2006 primary and secondary 24-hour NAAQS for PM2
.5). Inthe instance ofthe shmt-tenn averages, the Board has omitted the word "average" when creating a standardized name.Using the above-described convention, the standardizedNAAQS names (together with the conesponding citations to them in the Illinois and federal rules) are tabulated as follows:
Particulate matter CPMl: Standardized Narne 3 5 Ill. Adm. Code 40 C.P.R. "1987 primary and secondary 24-hour NAAQS for 243.120(a) 50.6 PM10" "1997 primary and secondary annual average 243.120(b) 50.7 NAAQS for PM2.s" "1997 primary and secondary 24-hour NAAQS for 243.120(b) 50.7 

### PM2.s" "2006 primmy and secondary annual average 243.120(c) 50.13 NAAQS for PM2.s

### " "2006 prima1y and secondary 24-hour NAAQS for 243.120(c) 50.13 

### PMz.s"

Sulfur oxides: StandardizedName 35 Ill. Adm. Code 40 C.P.R. "1971 primary annual average NAAQS for sulfur 243.122(a) 50.4 oxides" "1971 prima1y 24-hourNAAQS for sulfur oxides" 243.122(a) 50.4 "1971 secondary tluee-hourNAAQS for sulfur 243.122(b) 50.5 oxides" "2010 primary one-hourNAAQS for sulfur 243.122(c) 50.17 oxides"

Carbon monoxide: Standardized Name 35 Ill. Adm. Code 40C.P.R. "1971 eight-hour and one-hourNAAQS for carbon 243.123 50.8 monoxide" Nitrogen oxides: StandardizedNarne 3 5 Ill. Adm. Code 40 C.P.R. "1971 prima1y annual average NAAQS for 243.124(a) 50.ll(a) nitrogen oxides" "2010 primary one-hourNAAQS for nitrogen 243.124(b) 50.11(b) oxides" "1971 secondmy annual average NAAQS for 243.124(c) 50.ll(c) nitrogen oxides"Ozone: Standardized Name "1979 primary and secondary one-hourNAAQS for 0 3" "1997 primary and secondary eight-hour NAAQS for 

### 0 3" "2008 primmy and secondary eight-hour NAAQS for 

### 0 3"
Lead: 35 Ill. Adm. Code 40 C.F.R. None 50.9
243.125(a) 50.10
243.125(b) 50.15

Standardized Name 35 Ill. Adm. Code 40 C.F.R. "1978 primary and secondary quarterly average 243.126(a) 50.12 NAAQS for lead"4 "2008 primary and secondarythree-month average 243.126(b) 50.16 NAAQS for lead"

Removal ofTwo Illinois Rules
The removal oftwo existing Illinois mles requires briefspecific discussion. The principal reason for their removal is that these mles are not directly derived from the federal NAAQS. The first is the non-degradation clause of35 Ill. Adm. Code 243.104. The second is the monitoring provision of35 Ill. Adm. Code 243.106. Especially in the case ofthe "nondegradation" mle, the Board does not want misunderstanding to arise bythe removals.
Removal ofthe "Nondegradation" Rule. The non-degradation rule predates the Enviromnental Protection Act. The Board adopted the mle from earlier mles ofthe Air Pollution Control Board. 

### See Emission Standards, R71-23 (Api". 13, 1972), slip op. at 44-45. When adopting the mle, the Board explained that non-degradation "embodies the principle

... that parts ofthe State now clean shall not beunnecessarily degraded." 

### !d. Themle itselfis less clear than that briefdescription. The Board has removed the non-degradation clause of3 5 Ill. Adm. Code 243.104 because (I) it might conflict with a newly added federalmle; (2) it is not necessary in the context ofNAAQS; and (3) it is notpossible to correct its flaws in the context of this proceeding. Initially, the non-degradation clause may conflict the federal non-degradation requirement in 40 C.F.R 50.2(c) that the Board has incorporated at 35 Ill. Adm. Code 243.102(c). That statement, added to the Illinois rules, is as follows: "The promulgation ofprin1ary and secondaryNAAQS must not be considered in any manner to allow significant deterioration of existing air quality in any portion ofthis State." 35 Ill. Adm. Code 243.102(c). To the extent

4 This assumes that the Board does not omit the 1978 primary and secondary NAAQS for lead, as is discussed beginning on page 52 ofthis opinion and order.that the clause relates to theNAAQS themselves, the differences betweenthe Illinois mle and the newly added federal statement could conflict. Fm1hennore, byincorporating the federal language in 35 Ill. Adm. Code 243.102(c), the Illinois mles retain the intent of35 Ill. Adm. Code 243.104 that air quality in Illinois will notbe degraded. Second, the Board views non-degradation as directly related to air permitting, not as a segment ofthe federal NAAQS. To the extent that the Illinois non-degradation mle does not directly relate to the ambient air quality standards, the statement is not necessary in the present context. This is the pJinciple embodied in the federal Prevention ofSignificant Degradation (PSD) requirements. See 42 U.S.C. §§ 7470 etseq. (2011); 40 C.F.R. 51.166 and 52.21 (2012). Finally, the language ofthe mle is flawed. The opening statementimposes no requirement. Use ofthe word "willbe maintained" is a statement ofpresent intent, which does not impose an imperative, as would language that used a word such as "must." The second sentence is ambiguous as to the meaning of"lowered." Generally, a "lowered" pollutant loading is an improved air quality. A higherpollutant loading is a degraded air quality. Use ofthe word "degraded" inplace of"lowered" would remove this ambiguity. TheBoard cannot amend the mle in this way inthe context ofthis identical-in-substanceproceeding.
Removal ofthe "Monitoring" Rule. Existing 35 Ill. Adm. Code 243.106 requires the use offixed ormobile monit01ing stations located beyond the premises on which an emissions source is located, "according to the guidelines for established monitoring networks" that USEPA has developed. USEPA has codified the requirements for design, location, and operation of monitoring networks as 40 C.F.R. 58. See 40 C.F.R. 50 (2012).
The Board has removed the Illinois monitoring provision for several reasons. Initially, while imp011ant to implementation oftheNAAQS, this provisionis not a necessary segment of theNAAQS themselves. USEPA codified the monit01ing network requirements separately from theNAAQS. Further, the authority usedbyUSEPA for adoption ofthe monitoring network requirements does not include "Section I09 ofthe CleanAirAct" as required bythe present identical-in-substance mandate. See 415 ILCS 5/10(H), as added byP.A. 97-945, eff. Aug. 10, 2012; 40 C.F.R. 58 (2012) (source note). Second, the federal requirements for design, location, and operation ofmonitoring networks are self-in1plementing. See, e.g., 40 C.F.R. 50.10(a) and 50.1l(a) (2012). Thus, no Illinois provision is necessary inthis regard. Third, the vatious NAAQS require monitoring in compliance with specified procedures that incorporate the federal standards for design, location, and operation ofmonit01ing networks. Those standards are referenced in several ofthe methods and procedures required for monitoring. See Appendices A1, A-2, B, C, G, H, I, J, K, L, N, 

### 0, P, Q, R, S, and T to 40 C.F.R. 50 (2012).
Nevet1heless, should the record indicate that the Board mustretain a provisionrelative to design, location, and operation ofmonitoring stations, the Board could retain 35 Ill. Adm. Code 243.106 revised to read as follows:
All monitoring performed to fulfill the requirements ofthis Part mustbe perfotmed at stations and networks ofstations designed, located, and operatedaccording to plans approved by USEPA according to the requirements of40 C.F.R. 58. 5

Inclusion ofPrescribed Methods, Required Interpretations, and Special-Case Methods.
USEPA has approved multiple methods for use in demonstrating compliance with each NAAQS. The methods that the standards require for determining compliance are an essential aspect ofthe federal NAAQS. Different methods can produce different measurements. Thus, USEPA has specified the methods required for use and reserved authority to itselffor approval ofalternative methods.
The approved methods are ofthree types: (!)codified reference methods, (2) USEPAdesignated reference methods, and (3) USEPA-designated equivalent methods. Each NAAQS refers to areference method that is codified in an appendix to 40 C.F.R. 50. Many ofthe NAAQS finther allow the alternative use ofanother USEPA-designated reference method. OtherNAAQS allow the alternative use ofa USEPA-designated equivalent method. USEPA has further added appendices to 40 C.F.R. 50 that recite data handling conventions for some ofthe NAAQS. The following paragraphs outline the considerations relative to inclusion ofthese various methods-related materials into illinois NAAQS mles.
List ofDesignated Methods. USEPA designates methods for use in monitoring ambient air qualitybyprescribed procedures. 40 C.F.R. 53.2 and 53.3 (2012); see also 40 C.F.R. 53.11, 53.14, and 53.16 (2012) (relating to cancellation, modification, and supersession ofmethods designations, respectively). Under federal law, USEPA's designation ofa method is effective on the date ofFederalRegisterpublication. 40 C.F.R. 53.8(a) (2012). USEPA later compiles all of the methods designations into a single reference document known as the "List ofDesignated Reference and Equivalent Methods," from the USEPA, National Exposure Research Laboratory (List ofDesignatedMethods). 40 C.F.R. 53.8(c) (2012). Thus, there is a short time between when a designated method is available for use and when it appears in the List ofDesignated Methods.
The List ofDesignated Methods identifies the individual methods that are permissible for demonstrating compliance with each NAAQS, providing the following infonnationitems: (!) the method type; (2) the method source; (3) the method title; (4) a description ofthe method procedure, which may include notes onuse ofthe method; (5) one ormore citations to Federal Registernotices pertaining to USEPA designation ofeach method; and (6) the date ofany later modifications ofthe method (in some ofthe entries). Separate tabulations repeat some ofthe methods identifications in a summaryform, including a "method code" number. Finally, the List ofDesignated Methods includes a listing ofmethods sources and contact information. The List ofDesignated Methods includes all non-codified USEPA-designated reference methods and equivalent methods. The List does not include all ofthe codified reference methods.

5 The Board would notmally incorporate 40 C.F.R. 58 by reference when imposing its requirements. The Board, however, does not believe that incorporation by reference is necessary whenrequiring use ofa plan that is approved byUSEPA as compliant with 40 C.F.R. 58.The latest version ofthe List ofDesignated Methods is dated December 17, 2012. This edition ofthe List includes all methods designated byUSEPA through that date. USEPA designates reference method and equivalent methods on an ongoing basis. When USEPA designates a method, it publishes a FederalRegister notice ofthe designation. USEPA also posts a link to information about the newly designated reference method and equivalent methods on the Technology TransferNetwork, Ambient Monitoring Technology Infmmation Center (TTN-AMTIC) website. 6 USEPA periodicallyupdates the List ofDesignated Methods to include the federal reference methods (FRMs) and federal equivalent methods (FEMs) designated since the last version ofthe List. 7 Forexample, the December 17,2012 version ofthe List added equivalent methods designated by USEPA on September II, 2012 and October 5, 2012. See List ofDesignated Methods at 2; 77 Fed. Reg. 60985 (Oct. 5, 2012); 77 Fed. Reg. 55832 (Sept. 11, 2012). Incorporation ofDesignated Methods. The Board will incorporate by reference all USEPA methods designations into the Illinois NAAQS mles. Forthose methods listed in the List ofDesignated Methods, the incorporation byreference in 35 Ill. Adm. Code 243.108 will rely on the latest version ofthe List to identify the methods designated for eachNAAQS. For those methods that have not yet appeared in the List as ofthe date ofadoption offuture amendments, the Board will include incorporationbyreference to the FederalRegister notice of the USEPA designation.
When conducting the necessary semiannual reviews ofUSEPA actions to determine what identical-in-substance mlemaking action is necessary relative to theNAAQS, the Board will check the TTN-AMTIC website for any updates to the list orUSEPA methods designations that may exist only inthe form ofa FederalRegister notice, and either update the version ofthe List ofDesignated Methods incorporated byreference orincorporate byreferenceFederal Register notices, as appropriate.
As a matter ofIllinois law, inclusion ofa USEPA-designated reference method or equivalent method is effective on the date that the Board files an amendment to incorporate that method byreference. See 5 ILCS 100/5-40(d) (2012). This will result in anunavoidable delay up to a year (see 415 ILCS 5/7.2(b) (2012)) between the dates when USEPA has designated a new method and when the use ofthat method is acceptable as a matter ofIllinois law.
References to Methods in the Text ofthe NAAOS. Most ofthe federal NAAQS refer to designated methods in the text oftheNAAQS byreference to methods "designated in accordance withpart 53 ofthis chapter." See 40 C.F.R. 50.4(c), 50.5(b), 50.6(c)(l) and (c)(2), 50.7(a)(l) and (a)(2), 50.8(b)(1) and (b)(2), 50.9(a), 50.10(a), 50.11(a) and (d)(2), 50.13(a)(1) and (a)(2), 50.15(a), 50.16(a)(l) and (a)(2), and 50.17(c). One NAAQS omits this language, even though the use ofUSEPA-designatedmethods is required. See 40 C.F.R. 50.12(a) (2102) (lead).

6 http://www.epa.gov/ttn/amtic/cpreldoc.html.

7 The four priorpublished versions ofthe List ofDesignated Methods were dated June 6, 2012, October 12, 20II, April 1, 2011, and Febmary I, 2011.The Illinois NAAQS mles will specifY use ofmethods "designatedbyUSEPA and listed in List ofDesignated Methods, incorporated byreference in Section 243.108." See 35 Ill. Adm. Code 243.120(a)(3)(A), (a)(3)(B), (b)(l)(A), (b)(l)(B), (c)(l)(A), and (c)(l)(B); 243.122(a)(3), (b)(2), and (c)(3); 243.123(b)(l) and (b)(2); 243.124(d)(l) and (d)(2); 243.125(a)(l), (b)(!), and (c)(!); and 243.126(a)(l), (b)(I)(A), and (b)(I)(B). USEPA alone has authority to designate monitmingmethods. See 40 C.F.R. 53.8(a), 53.ll(a), 53.14(c), and 53.16(a) (2012); see also 42 U.S.C. 

### § 7403(c) (2011) (requiring USEPA to establish "methods for sampling, measurement, monitoring, analysis, and modeling ofair contaminants"). The language chosen bythe Board for each ofthe NAAQS translates this federal requirement into their Illinois counterpatts.
Standardization ofTerms: FRMs, FEMs, and List ofDesignated Methods. Inthe course ofidentical-in-substance mlemaking, the Boardroutinely attempts to standardize the language used where variation appears in the language offederalmles. That is tme inthis proceeding in several regards, butparticularly inthe naming ofmonitoring methods. Other shifts in phrasing are considered in later segments ofthis discussion.
To standardize the naming ofUSEPA-designated methods, the Board has combined usage from two segments oftheUSEPAregulations: (I) the NAAQS mles themselves; and (2) the mles pettaining to methods designations. As a result, the Illinois NAAQS mles define the standardized terms "federal reference method" and "federal equivalent method" in 35 Ill. Adm. Code 243.102.
The definition of"federal reference method" combines the parallel federal definitions of "referencemethod," incmTesponding 40 C.F.R. 50.1(£), and "federal reference method" in 40 C.F.R. 53.1, which is intheprovisions for approval ofthese methods. The Board has further used the defmed abbreviation "FRM" for this term throughout the substantive provisions ofthe NAAQS-derived regulations. This is without regard to whether the method is codified as an appendix to 40 C.F.R. 50 or the method is a USEPA-designated reference method that is based on a method codified as an appendix. Similarly, the definition of"federal equivalent method" combines the parallel federal definitions of"equivalent method," in corresponding 40 C.F.R. 50.l(g), and "federal equivalent method" in 40 C.F.R. 53.1. The Board has used the defined abbreviation "FEM" to refer to the equivalent methods.
The following discussions use the abbreviations "FRM" and "FEM" to referto the methods. The discussions distinguish between the codified and USEPA-designated non-codified FRMs where necessary. 

### Codified andNon-Codified FRMs. The federal NAAQS include two types ofFRMs. There are the FRMs codified in appendices to 40 C.F.R. 50, and there are non-codified FRMs that USEPA has designated. The federal NAAQS use two distinct phrasings to allow use of FRMs. The Board here observes possible inconsistent usage in the federal language, but makes no attempt to reconcile the language. Therevisions to the federal text that the Board has madeare limited to standardizations ofterms. The Board intends that the IllinoisNAAQS rules have the same substantive effect as do the federal NAAQS upon which they are based.
Most ofthe NAAQS provisions describe the pem1issible FRMs in the following terms: "areference method based on [the reference method cited inthe] appendix

... and designated [by USEPA]." See 40 C.F.R. 50.6(c)(l) (PM 10), 50.7(a)(l) (PM2s), 50.8(b)(l) (carbon monoxide), 50.9(a) (ozone), 50.10(a) (ozone), 50.ll(d)(l) (nitrogen oxides), 50.13(a)(l) (PM25), and 50.15(a) (ozone) (2012). The List ofDesignated Methods includes numerous non-codified FRMs for these contaminants, butnone ofthe codified FRMs from 40 C.F.R. 50. See List of Designated Methods, at 4-9 (16 for PM 10), 10-15 (17 for PM25), 25-30 (nine for ozone), 31-34 (20 for carbon monoxide), and 35-41 (26 for nitrogen oxides). The absence ofcodified FRMs in the List for these contaminants is literally consistent with the teim "anFRM based on [the reference method cited in] appendix

... and designated by USEPA."
The Board has followed the federal language very closely in the cmTesponding Illinois NAAQS provisions, with three shifts in language discussed in the immediately foregoing paragraphs: (I) the Board standardized usage ofthe defined teim "an FRM"; (2) the Board clearly stated the requirement for USEPA-designation ofthe FRM; and (3) the Board added a reference to the List ofDesignated Methods. Thus, the con·esponding Illinois NAAQS use the phrasing "an FRM based on appendix

... and designated byUSEPA and listed in List of Designated Methods, incorporated byreference in Section 243.108." See 35 Ill. Adm. Code 243.120(a)(3)(A), (b)(l)(A), and (c)(l)(A) (PM 10 and PM25); 243.123(b)(l) (carbon monoxide); 243.124(d)(l) (nitrogen oxides); and 243.125(a)(l), (b)(!), and (c)(!) (ozone).
The Board notes the potential for ambiguities in the federal language. The first ambiguity concems whether some FRMs are directly available for use when USEPAhas specified use of"an FRM based on"the codified FRM. The second, related, ambiguity is whether a codified FRM is available for use even though that FRM is not included in the List of Designated Methods.
The NAAQS for carbon monoxide, ozone, nitrogen oxides, PM 10, and PM2
.5require use ofanFRM "based on" an associated appendix to 40 C.F.R. 50. See 40 C.F.R. 50.6(c)(l) (2012) ("based on appendix J" for PM10); 40 C.F.R. 50.7(a)(l) and 50.13(a)(l) (2012) ("based on appendix L" for PM2
.5 ); 40 C.F.R. 50.8(b)(l) (2012) ("based on appendix C" for carbon monoxide); 40 C.F.R. 50.9(a), 50.10(a), and 50.15(a) (2012) ("based on appendix D" for ozone); 40 C.F.R. 50.ll(d)(l) (2012) ("based on appendix F" for nitrogen oxides). Further, the List of Designated Methods does not include listings for Appendices C, D, F, J, and L to 40 C.F.R. 50, relative to carbon monoxide, ozone, nitrogen oxides, PM 10, and PM2
.5, respectively. The general rules relative to FRM designations for PM10, PM2.5 , carbon monoxide, ozone, and nitrogen oxides require that the FRM "meets all requirements specified in"the particular appendix associated with that FRM. See 40 C.F.R. 53.2(a)(2), (a)(3), and (b) (2012).
The NAAQS for sulfuroxides add to the potential for ambiguity. The three 1971 NAAQS for sulfur oxides (the 1971 primary annual averageNAAQS for sulfur oxides, the 1971 primary 24-hourNAAQS for sulfur oxides, and the 1971 secondary three-hourNAAQS for sulfur oxides) use a second te1m to refer to the permissible FRM: "the reference methoddescribed in appendix [A-2]." See 40 C.P.R. 50.4(c) and 50.5(b) (2012). The general rules for methods designations allow no manual method other than the codified FRM in appendix A-2 to 40 C.P.R. 50. See 40 C.P.R. 53.2(a)(l) (2012). The general rules further specify that an automated FRM for sulfur oxides "mustuse the measurement principle and calibration procedure specified in" Appendix A-I to 40 C.P.R. 53.2(b) (2012). Consistent with use restricted to the codified FRM for sulfur oxides is the fact that the only FRM included in the List ofDesignated Methods is the manual method ofAppendix A-2 to 40 C.P.R. 50. See List ofDesignated Methods, at 18.
Onthe other hand, the 2010 plimary one-hourNAAQS for sulfur oxides uses the tenn "anFRMbased on appendix [A-2] orA-1." See 40 C.P.R. 50.17(c) (2012). This language is thatused for theNAAQS for which no codified FRM is included in the List ofDesignated methods.
The NAAQS for lead are also unique cases that enhance thepotential for ambiguity. The leadNAAQS require an FRM "based on appendix G." See 40 C.P.R. 50.12(a) and 50.!6(a)(l) (2012). The only FRM included in the List ofDesignated Methods is Appendix G. List of Designated Methods, at 42. Further, the general rules for FRM designation explicitly state that "othermanual methods for lead will not be considered for a reference method determination," and they do not provide for approval ofautomated FRMs for lead. 40 C.P.R. 53.2(a)(l) and (b) (2102).
The Boardhas made no effort to clarify the federal language in this regard. The Board has followed the federal language with the above-described changes, retaining any potential ambiguities. Ifthere is any difference in meaning between "an FRM based on" and "the FRM described in" language, the Board does not wish to blur any distinctions. The only distinction that the Board makes is that some FRMs are codified and others are non-codified. Fmther, the Board observes that only two ofthe codified FRMs are included in List ofDesignated Methods.
From a practical perspective, in the context ofthis identical-in-substance proceeding, the main difference between a codified FRM and a non-codified FRMis how each type is incorporated byreference into the Illinois regulations. From the broaderperspective ofwhat USEPA intended as to the meaning ofthe rules, the Board cannot mitigate any potential for ambiguity. Non-CodifiedFEMs. The third type ofUSEP A-designated method is an FEM. All of the FEMs are non-codified. USEPA refers to them all (often conjunctively with FRMs) with uniform language: "an equivalent method designated in accordance with pa1t 53 ofthis chapter." See 40 C.P.R. 50.4(c), 50.5(b), 50.6(c)(2), 50.7(a)(2), 50.8(b)(2), 50.ll(d)(2), 50.13(a)(2), 50.15(a), 50.16(a)(2), and 50.17(c) (2012) (NAAQS for sulfur oxides, PM10, PM2
.5, carbon monoxide, nitrogen oxides, ozone (except the 1997 NAAQS), and lead). The federal regulations include two consistent variations on this language: (I) the NAAQS for lead omits "designated in accordance with part 53 ofthe chapter" (see 40 C.P.R. 50.12(a) (2012)); and (2) the 2010 NAAQS for sulfur oxides capitalizes "Federal Equivalent Method" and adds "(FEM)" (see 40 C.P.R. 50.17(c) (2012)). The List ofDesignatedMethods includes all ofthe FEMs. See List of Designated Methods, at 4-9 (II for PM 10), 10-15 (17 for PM2_s), 18-24 (34 for sulfur oxides), 25-30 (23 for ozone), 31-34 (none for carbon monoxide), 35-41 (five for nitrogen oxides), and 42-45 (27 for lead). Only two federal NAAQS do not refer to the use ofan FEM. These are the 1997 primary and secondary one-hour and eight-hourNAAQS for ozone. Instead, these NAAQS recite only the use ofan FRM. See 40 C.P.R. 50.9(a) and 50.10(a) (2012). The Board could fmd no explanation why these standards do not referto FEMs. See 62 Fed. Reg. 38856 (July 18, 1997) (adopting the 1997 standards). Further, theList ofDesignated Methods includes 23 FEMs for ozone. See List ofDesignated Methods at 25-30.
The Board has uniformly used "an FEM designated byUSEPA and listed in List of Designated Methods, incorporated byreference in Section 243.108" throughout all ofthe NAAQS, except for the 1997 p1immy and secondaryNAAQS for ozone. See 35 Ill. Adm. Code 243.120(a)(3)(B), (b)(l)(B), and (c)(l)(B); 243.122(a)(3), (b)(2), and (c)(3); 243.123(b)(2); 243.124(d)(2); 243.125(a)(l), (b)(!), and (c)(!); and 243.126(a)(l) and (b)(l)(A) (NAAQS for PM 10, PM 2
.5, sulfur oxides, carbon monoxide, nitrogen oxides, ozone (2008 NAAQS), and lead. This meant confmming the two consistent variations in language ofthe federal NAAQS for sulfur oxides and lead, cited above. See 35 Ill. Adm. Code 243.122(a)(3), (b)(2), and (c)(3) and 243.126(a)(l) and (b)(l)(B).
Onthe otherhand, the Board has not tried to reconcile the potential inconsistency with regard to the 1997 ozone standards. The Boardhas added no references to FEMs relative to those two NAAQS. See 35 Ill. Adm. Code 243.125(a)(l) and (b)(!).
The Difference Between FRMs and FEMs. Fromthe practical perspective ofuse, the Board sees no difference between an FRM (whether codified or non-codified) and an FEM. The federal NAAQS authmize the use ofeither type ofmethod. Still, there is a qualitative difference betweenthe two types ofmethods. USEPA recited as follows with regard to methods for PM25 : [R]eference methods

... are intended to provide for unifonn, reproduceable [sic] measurements of

... [ciiteria pollutant] concentrations in ambient air to serve as a measurement standard for the primarypurpose ofmaking comparisons to the NAAQS. Equivalent methods

... allow for the consideration and introduction of new and innovative

... [Ciiteiia pollutant] measurement technologies for this same purpose, provided such new technologies can be shown to provide

... [ ciite1ia pollutant] measurements comparable to reference measurements under a variety oftypical monitoring conditions. 62 Fed. Reg. 38764, 65 (July 18, 1997).
The Board observes that the federal mles divide FEMs for PM2.5 into three classes: Class I, Class II, and Class III. Thedistinctions are based on the analyzerused. See 40 C.P.R. 53.1 (2012) (definitions of"Class I equivalent method," "Class II equivalent method," and "Class III equivalent method"). The perfmmance characteristics and designationprocedures for each class differs. See 40 C.P.R. 53.3(a)(2) and (a)(3) (2012); table C-4 to subpart C of40 C.P.R. 53 (2012). USEPA explained that the classes are intended "[t]o minimize thenumber and extent of perfmmance tests to which candidate equivalent methods are subjected

...." 62 Fed. Reg.38764, 66 (July 18, 1997). Since the classes ofPEMs do not relate directly to anyNAAQS, the Board does not need to include these classes in the Illinois NAAQS rules. Interpretations: Conventions for Data Management and Analvsis. Many ofthe federal NAAQS reference "interpretations" that outline the procedure for using monitoring data to determine compliance withtheNAAQS. All ofthese interpretations are embodied in an appendix to 40 C.P.R. 50. The federal NAAQS require use ofthe interpretations as follows: Appendix H: The 1997 primary and secondary one-hourNAAQS for ozone requires use of Appendix H to 40 C.P.R. 50 "to dete1mine whenthe expected number ofdays per calendar" is below the regulatory threshold level. See 40 C.P.R. 50.9(a) (2012); Appendix H to 40 C.P.R. 50 (2012) (introductory paragraph). Appendix I: The 1997 primary and secondmyeight-hourNAAQS for ozone requires determination ofcomplianceusing the "data handling conventions and computations" ofAppendix Ito 40 C.P.R. 50. See 40 C.P.R. 50.10(b) (2012); Appendix I to 40 C.P.R. 50 (2012) (introductory paragraph). Appendix K: The 1987 primary and secondary 24-hourNAAQS for PM 10 requires determination ofcomplianceusing the "computations" ofAppendix K to 40 C.P.R. 50. See 40 C.P.R. 50.6(c)(l) (2012); Appendix K to 40 C.P.R. 50 (2012) (introductory paragraph). AppendixN: The 1997 and 2006 prirnmy and secondary annual average and 24-hourNAAQS for PM,.s (fourNAAQS) require dete1mination ofcompliance using the "data handling conventions and computations" ofAppendixN to 40 C.P.R. 50. See 40 C.P.R. 50.7(b) and 50.13(b) (2012); Appendix N to 40 C.P.R. 50 (2012) (introductory paragraph). Appendix P: The 2008 primary and secondary eight-hourNAAQS for ozonerequires determination ofcomplianceusing the "data handling conventions and computations" ofAppendix P to 40 C.P.R. 50. See 40 C.P.R. 50.15(b) (2012); Appendix P to 40 C.P.R. 50 (2012) (introductory paragraph). Appendix R: The 2008 primary one-hourNAAOS for sulfur oxides requires determination of compliance using the "data handling conventions and computations" ofAppendix R to 40 C.P.R. 50. See 40 C.P.R. 50.16(b) (2012); Appendix R to 40 C.P.R. 50 (2012) (introductory paragraph). Appendix S: The 1971 primary annual average and 2010 primary one-hourNAAQS for nitrogen oxides (two NAAQS) require determination ofcompliance using the "datahandling conventions and computations" ofAppendix S to 40 C.P.R. 50. See 40 C.P.R. 50.ll(e) and (f) (2012); Appendix S to 40 C.P.R. 50 (2012) (introductory paragraph).Appendix T: The 20I0 primary one-hourNAAQS for sulfur oxides requires determination of compliance using the "data handling conventions and computations" ofAppendix T to 40 C.P.R. 50. 

### See 40 C.P.R. 50.17(b) (2012); Appendix T to 40 C.P.R. 50 (2012) (introductoryparagraph).
Some ofthe oldest existingNAAQS do not require use ofinterpretations, including the following:
The 1971 primary annual average NAAQS for sulfur oxides 

### (see 40 C.P.R. 50.4 (2012)); The 1971 primary annual average NAAQS for sulfur oxides 

### (see 40 C.P.R. 50.4 (2012)); The 1971 secondary three-hourNAAQS for sulfur oxides 

### (see 40 C.P.R. 50.5 (2012)); The 1971 p1imary eight-hourNAAQS for carbon monoxide 

### (see 40 C.P.R. 50.8 (2012)); The 1971 primary one-hour NAAQS for carbon monoxide 

### (see 40 C.P.R. 50.8 (2012)); The 1971 secondary annual average NAAQS for nitrogen oxides 

### (see 40 C.P.R. 50.11 (2012)); and The 1978 primary and secondary qumterly average NAAQS for lead 

### (see 40 C.P.R. 50.12 (2012)).
The Special Case FRMs ofAppendices B, 0, and Q. Three codified FRMs are not directly relied onby anyNAAQS. The Board has included all three FRMs in the Illinois NAAQS because each is substantivelyrelied on in another codified FRM. The following paragraphs explain the special circumstances ofeach ofthese codified FRMs. 

### AppendixB: FRMtor TotalSuspendedParticulateMatter. An oldNAAQS for particulate matter (PM) f01merly relied on Appendix B to 40 C.P.R. 50. 

### See 40 C.F.R 50.6 (1983). USEPA retained Appendix B to 40 C.P.R. 50, when USEPA subsequentlyreplaced the PMNAAQS with the PM10 NAAQS and Appendix J to 40 C.P.R. 50 for PM 10 supplanted Appendix B for PM. USEPA did so because Appendix B is substantivelyreferenced in Appendix G to 40 C.P.R. 50, for the purposes ofthe leadNAAQS. 

### See 52 Fed. Reg. 24634, 48 (July I, 1987).
The substantive reliance on Appendix B remains inAppendix G to 40 C.P.R. 50. 

### See Appendix G to 40 C.P.R. 50 (2012),

**at~** 5.1.1. Forthis reason, the Boardhas retained the incorporation byreference to Appendix Bin 35 Ill. Adm. Code 243.108, noting the reference to this document inAppendix G to 40 C.P.R. 50. 

### Appendix 0: FRM(or Coarse ParticulateMatter (PM10•2
.5

### l. USEPA once proposed, yet declined to adopt a NAAQS for coarse particulate matter (PM 10•2
.5). 

### See 71 Fed. Reg. 61144, 94 (Oct. 17, 2006); 71 Fed. Reg. 2620, 98 (Jan. 17, 2006) (proposing a 24-hour standard of70 )lg/m3 as 40 C.P.R. 50.13(a)(2)(i)). USEPA, however, adopted the proposed FRM for PM 10.25 as Appendix 0 to 40 C.P.R. 50. 

### See 71 Fed. Reg. 61144, 230 (Oct. 17, 2006) (NAAQS amendments); 

### see also 71 Fed. Reg. 61236, 38 (Oct. 17, 2006) (accompanying amendments to 40 C.P.R. 53 and 58). USEPA explained as follows:
An official FRMwill be an important element in facilitating consistent research onPM 10

_25 air quality and health effects and in promoting the commercialdevelopment ofFEMs. In a separate final rule

... [US]EPA is promulgating a requirement that States deploy about 60 FRM or FEM PM10

_ 25 monitors as part of a new National Core (NCore) multi-pollutant monitoring stations. 71 Fed. Reg. 61144,212 (Oct. 17, 2006).


### In accompanying amendments to the ambient air quality surveillance requirements, USEPA required all states to establish and operate at least one NCore8 monitoring site. USEPA provided that Illinois would need to establish and operate one ortwo additional sites. See Appendix D to 40 C.F.R. 58 (2012),

**at~** 3(a); 71 Fed. Reg. 61236, 39 (Oct. 17, 2006). Monitoring for PM10

.25 is required at each NCore site. See 40 C.F.R. 58.12(f)(l) (2012); Appendix D to 40 C.F.R. 58 (2012),

**at~** 3(b); see also 40 C.F.R. 58.1 (2012) (definition of "NCore"). Fmther, Appendix Q to 40 C.F.R. 50 relies on Appendix 

### 0 for descliption ofthe required sampler, sampling period, measurement procedures, etc. See Appendix Q to 40 C.F.R. 50 (2012),

**at~~** 1.2 and 3.1. Appendix Q is considered in the following segment ofthis discussion, immediatelybelow. Thus, the NCore monitoring provisions sites and Appendix Q to 40 C.F.R. 50 rely on Appendix 

### 0 to 40 C.F.R. 50. This is despite the fact that Appendix 

### 0 is notpat1 ofan active NAAQS. Forthis reason, the Board has retained the incorporation byreference to Appendix 

### 0 in 35 Ill. Adm. Code243.108, noting the reference to this document in Appendix Q to 40 C.F.R. 50. The Board has also noted that this method is "foruse in federally required monitoring by the NCore system pursuant to 40 CFR 58." Appendix 0: FRMfor Leadin ParticulateMatter (PM 10



### l.:. USEPA once proposed revising the NAAQS for lead, which is lead inultra-coarse pat1iculate matter (Pb-PM) to lead in coarse particulate matter (Pb-PM10). See 73 Fed. Reg. 66964, 88-89 (Nov. 12, 2008). USEPA retained the Pb-PM standard, but not the PB-PM standard because the data was insufficient to establish the relationship between Pb-PM10 levels and health effects. See id. at 66991. USEPA, however, allowed limited use ofPb-PM10 data to establish non-compliance (see id. at 67019) or to establish compliance where the levels oflead in the air are anticipated to be substantially below the standard and ultra-coarse particles are not expected (see id. at 66991). Thus, USEPA adopted the interpretation ofthe 2008 primary and secondaty three-month average NAAQS for lead as Appendix R to 40 C.F.R. 50. Appendix R refers to the FRM for Pb-PM10 in Appendix Q. See Appendix R to 40 C.F.R. 50 (2012),

**at~** 1(a); 73 Fed. Reg. at 67019-21.
The substantive reliance on Appendix Q in Appendix R to 40 C.F.R. 50 wanants inclusion ofAppendix Q inthe Illinois NAAQS rules. Appendix Q provides an altemative monitoring methodology for the 2008 NAAQS for lead. For this reason, the Board has retained the incorporation byreference to Appendix Q in 35 Ill. Adm. Code 243.108, noting the reference to this document in Appendix R to 40 C.F.R. 50.

8 Defined as the "National Core multipollutant monitoring stations" that monitor

### PM 25, speciated PM2
.5 PM10

.2
.5, ozone, sulfur dioxide, carbon monoxide, nitrogen oxides, lead, and basic weather data. 40 C.F.R. 58.1 (2012).

### Summarv Tabulation ofthe NAAQS and Supporting Appendices. The following tabulation lists all ofthe federal NAAQS, the codified FRM and any "interpretation" associated with each.


### NAAOSfor Sulfur Oxides: NAAQS: 1971 primary annual average NAAQS for sulfur oxides Citations: 40 C.F.R. 50.4(a)/35 Ill. 

### Adm. Code 243.122(a)(l) FRM specified: Appendix A-2 to 40 C.F.R. 50 Citations: 40 C.F.R. 50.4(c)/35 Ill. 

### Adm. Code 243.122(a)(3) Interpretation specified: None NAAQS: 1971 primary 24-hourNAAQS for sulfur oxides Citations: 40 C.F.R. 50.4(a)/35 Ill. 

### Adm. Code 243.122(a)(l) FRM specified: Appendix A-2 to 40 C.F.R. 50 Citations: 40 C.F.R. 50.4(c)/35 Ill. 

### Adm. Code 243.122(a)(3) Interpretation specified: None NAAQS: 1971 secondary three-hour NAAQS for sulfur oxides Citations: 40 C.F.R. 50.5(a)/35 Ill. Adm. Code 243.122(b)(1) FRM specified: Appendix A-2 to 40 C.F.R. 50 Citations: 40 C.F.R. 50.5(b)/35 Ill. 

### Adm. Code 243 .122(b)(2) Interpretation specified: None NAAQS: 2010 mimary one-hourNAAQS for sulfur oxides Citations: 40 C.F.R. 50.17(a)/35 Ill. 

### Adm. Code 243.122(c)(1) FRM specified: Appendix A-1 orA-2 to 40 C.F.R. 50 Citations: 40 C.F.R. 50.17(c)/35 Ill. 

### Adm. Code 243.122(c)(3) Interpretation specified: Appendix T to 40 C.F.R. 50 Federal citation: 40 C.F.R. 50.17(b)/35 Ill. 

### Adm. Code 243.122(c)(2)


### NAAOS (or PM1o andPM,.s: NAAQS: 1987 primarv and secondary 24-hour NAAOS for PM 10 

### Citations: 40 C.F.R. 50.6(a)/35 Ill. 

### Adm. Code 243.120(a)(l) FRM specified: Appendix J to 40 C.F.R. 50 Citations: 40 C.F.R. 50.6(c)(l)/35 Ill. Adm. Code 243.120(a)(3)(A) Interpretation specified: Appendix K to 40 C.F.R. 50 Citations: 40 C.F.R. 50.6(a)/35 Ill. 

### Adm. Code 243.120(a)(l) NAAQS: 1997 primary and secondary annual average NAAQS for PM22 Citations: 40 C.F.R. 50.7(a)/35 Ill. 

### Adm. Code 243.120(b)(l) FRM specified: Appendix Lto 40 C.F.R. 50 Citations: 40 C.F.R. 50.7(a)(l)/35 Ill. Adm. Code 243.120(b)(l)(A)

### Interpretation specified: Appendix N to 40 C.P.R. 50 Citations: 40 C.P.R. 50.7(b)/35 Ill. Adm. Code 243.120(b)(2) NAAQS: 1997 primary and secondary 24-hour NAAQS for PM,_5 

### Citations: 40 C.P.R. 50.7(a)/35 Ill. 

### Adm. Code 243.120(b)(l) PRM specified: Appendix Lto 40 C.P.R. 50 Citations: 40 C.P.R. 50.7(a)(l)/35 Ill. 

### Adm. Code 243.120(b)(l)(A) Intetpretation specified: Appendix N to 40 C.P.R. 50 Citations: 40 C.P.R. 50.7(b)/35 Ill. 

### Adm. Code 243.120(b)(2) NAAQS: 2006 primary and secondary annual average NAAQS for PM, 5 

### Citations: 40 C.P.R. 50.13(a)/35 Ill. 

### Adm. Code 243.120(c)(l) FRM specified: Appendix Lto 40 C.P.R. 50 Citations: 40 C.P.R. 50.13(a)(l)/35 Ill. Adm. Code 243.120(c)(l)(A) Interpretation specified: Appendix N to 40 C.P.R. 50 Citations: 40 C.P.R. 50.13(b)/35 Ill. 

### Adm. Code 243.120(c)(2) NAAQS: 2006 primary and secondary 24-hourNAAQS for PM,_5 

### Citations: 40 C.P.R. 50.13(a)/35 Ill. 

### Adm. Code 243.120(c)(l) PRM specified: Appendix L to 40 C.P.R. 50 Citations: 40 C.P.R. 50.13(a)(l)/35 Ill. Adm. Code243.120(c)(l)(A) Interpretation specified: Appendix N to 40 C.P.R. 50 Citations: 40 C.P.R. 50.13(c)/35 Ill. 

### Adm. Code 243.120(c)(3)


### NAAOS (or Carbon Monoxide: NAAQS: 1971 primary eight-hourNAAQS for carbonmonoxide Citations: 40 C.P.R. 50.8(a)(l)/35 Ill. Adm. Code 243.123(a)(l) PRM specified: Appendix C to 40 C.P.R. 50 Citations: 40 C.P.R. 50.8(b)(l)/35 Ill. Adm. Code 243.123(b)(l) Intetpretation specified: None NAAQS: 1971 primary one-hourNAAQS for carbon monoxide Citations: 40 C.P.R. 50.8(a)(2)/35 Ill. Adm. Code 243.123(a)(2) PRM specified: Appendix C to 40 C.P.R. 50 Citations: 40 C.P.R. 50.8(b)(l)/35 Ill. 

### Adm. Code 243.123(b)(l) Intetpretation specified: None


### NAAOS (or Ozone: NAAQS: 1979 primary and secondary one-hour NAAQS for ozone Citations: 40 C.P.R. 50.9(a)/No corresponding Illinois provision PRM specified: Appendix D to 40 C.P.R. 50 Citations: 40 C.P.R. 50.9(a)/No corresponding Illinois provision Interpretation specified: Appendix H to 40 C.P.R. 50 Citations: 40 C.P.R. 50.9(a)/No corresponding Illinois provisionNAAQS: 1997 primary and secondary eight-hour NAAOS for ozone Federal citation: 40 C.P.R. 50.10(a)/35 Ill. Adm. Code 243.125(a)(1) FRM specified: Appendix D to 40 C.P.R. 50 Citations: 40 C.P.R. 50.10(a)/35 Ill. Adm. Code 243.125(a)(J) Inte1pretation specified: Appendix I to 40 C.P.R. 50 Citations: 40 C.P.R. 50.JO(b)/35 Ill. Adm. Code 243.125(a)(2) NAAQS: 2008 primary and secondary eight-hourNAAOS for ozone Federal citation: 40 C.P.R. 50.15(a)/35 Ill. Adm. Code 243.125(b)(J) FRM specified: Appendix D to 40 C.P.R. 50 Citations: 40 C.P.R. 50.15(a)/35 Ill. Adm. Code 243.125(b)(J) Inte1pretation specified: Appendix P to 40 C.P.R. 50 Citations: 40 C.P.R. 50.15(b)/35 Ill. Adm. Code 243.125(b)(2)
NAAOS (or Nitrogen Oxides: NAAQS: 1971 primary annual average NAAQS for nitrogen oxides Citations: 40 C.P.R. 50.11(a)/35 Ill. Adm. Code 243.124(a) FRM specified: Appendix F to 40 C.P.R. 50 Citations: 40 C.P.R. 50.11(d)(1)/35lll. Adm. Code 243.124(d)(J) Interpretation specified: Appendix S to 40 C.P.R. 50 Citations: 40 C.P.R. 50.1l(e)/35 Ill. Adm. Code 243.124(e) NAAQS: 2010 primary one-hourNAAQS for nitrogen oxides Citations: 40 C.P.R. 50.11(b)/35 Ill. Adm. Code 243.124(b) FRM specified: Appendix F to 40 C.P.R. 50 Citations: 40 C.P.R. 50.11(d)(1)/35 ill. Adm. Code 243.124(d)(1) Inte1pretation specified: Appendix S to 40 C.P.R. 50 Citations: 40 C.P.R. 50.11(f)/35 Ill. Adm. Code 243.124(f) NAAQS: 1971 secondary annual average NAAQS for nitrogen oxides Citations: 40 C.P.R. 50.11(c)/35 Ill. Adm. Code 243.124(c) FRM specified: Appendix F to 40 C.P.R. 50 Citations: 40 C.P.R. 50.11(d)(l)/35 ill. Adm. Code 243.124(d)(l) Interpretation specified: None
NAAOS (or Lead: NAAQS: 1978 primary and secondary quarterly average NAAQS for lead Citations: 40 C.P.R. 50.12(a)/35 Ill. Adm. Code 243.126(a)(J) FRM specified: Appendix G to 40·C.F.R. 50 (relying on Appendix B) Citations: 40 C.P.R. 50.12(a)/35 Ill. Adm. Code 243.126(a)(J) Interpretation specified: NoneNAAQS: 2008 primary and secondary tln·ee-month average NAAQS for lead Citations: 40 C.P.R. 50.16(a)/35 

### Ill. Adm. Code 243.126(b) PRM specified: Appendix G to 40 C.P.R. 50 (relying on Appendix B) Citations: 40 C.P.R. 50.16(a)(l)/35 Ill. Adm. Code 243.126(b)(l)(A) Interpretation specified: Appendix R to 40 C.P.R. 50 (relying on Appendix Q, which relies onAppendix 0) Citations: 40 C.P.R. 50.16(b)/35 

### Ill. Adm. Code 243.126(b)(2)


### Non-NAAOSRequiredMonitoring: Required by: NCore monitoring for PM 10

_ 2

_

5 Citation: 40 C.P.R. 58.12(±)(1) PRM specified: Appendix 0 to 40 C.P.R. 50 Citation: Appendix D to 40 C.P.R. 58 (2012),

**at~** 3(b)
Summarv re Incorporation ofthe FRMs, FEMs, and Interpretations. Based on the foregoing, the Boardhas incorporated the three types ofUSEPA-designated monitoring methods in the following ways. All ofthe incorporations have beendone by incorporations byreference, as described. 

### CodifiedFRMs. The Board has incorporated byreference all ofthe appendices to 40 C.P.R. 50 that codify an PRM that is cited in an NAAQS. These appendices set forth the text of the method itself. These incorporations byreference directly involve each ofthe federal appendices. 

### See 35 Ill. Adm. Code 243.108. At present, there are eight codified PRMs that directly support an NAAQS included in the appendices: Appendices A-1, A-2, C, D, P, G, J, and L to 40 C.P.R. 50. 

### Non-CodifiedFRMs. The Board has incorporated byreference the listing ofall ofthe non-codified PRMs, but not the PRMs themselves. These methods are identified in the List of Designated Methods, but the actual method is not set forth in full. Thus, the Board includes these non-codified methods in the Illinois regulations byincorporation byreference to the List of Designated Methods. 

### See 35 Ill. Adm. Code 243.108. Atpresent, there are 88 non-codified PRMs included in the List ofDesignated Methods: 16 for PM 10, 17 for PM2
.5, three for PM 10

_ 25, nine for ozone, 20 for carbonmonoxide, 26 for nitrogen oxides. None are listed for sulfur oxides and lead. 

### Non-CodifiedFEMs. The Board has incorporated byreference the listing ofall ofthe PEMs, all ofwhich are non-codified. These methods are identified inthe List ofDesignated Methods, inthe same manner as are the non-codified PRMs, withthe actual method not set forth in full. As for the non-codified PRMs, the Board includes the PEMs inthe Illinois regulations by incorporation byreference to the List ofDesignatedMethods. 

### See 35 Ill. Adm. Code 243.108. Atpresent, there are 127 PEMs included inthe List ofDesignated Methods: 11 for PM 10, 17 for 

### PM 25, 34 for sulfur oxides, 23 for ozone, five for nitrogen oxides, and 27 for lead. There are none for carbon monoxide.Interpretations. The Board has incorporatedbyreference all ofthe interpretations relative to the various NAAQS, all ofwhich are codified as appendices to 40 C.F.R. 50. As for the codified FRMs, the Board includes the interpretations in the Illinois regulations by incorporationbyreference ofthe various appendices. See 35 Ill. Adm. Code 243 .I08. At present, there are eight interpretations included inthe appendices: Appendices H, I, K, N, P, R, S, and T to 40 C.F.R. 50.
The Special-Case FRMs. The Board has incorporated byreference all ofthe specialcase FRMs that do not directly relate to theNAAQS, all ofwhich are codified as appendices to 40 C.F.R. 50. As for the codified FRMs that directly supportthe NAAQS, the Board includes theFRMs inthe Illinois regulations byincorporationbyreference ofthe various appendices. See 35 Ill. Adm. Code 243.108. Atpresent, there are three special-case FRMs that do not directly support anNAAQS included in the appendices: Appendices B, 0, and Q to 40 C.F.R. 50.


### Omission ofAncillarv Federal Regulations in 40 

### C.F.R. 53, 58, and 81
USEPAuses theprocedures of40 C.F.R. 53 to make FRM and FEM designations. See 40 C.F.R. 53.2, 53.3, and 53.8 (2012). Further, USEPAuses those rules to remove methods from theList ofDesignatedMethods. See 40 C.F.R. 53.11 and 53.16 (2012). TheBoard does not read the mandate ofSection IO(H) ofthe Act as requiring adoption ofprovisions from 40 C.F.R. 53. While the methods approved byUSEPA pursuantto 40 C.F.R. 53 are vital to implementing the standards, onlythe methodsthemselves are specified withinthetext ofthe NAAQS. Since no NAAQS directly depends on anyprovision of40 C.F.R. 53, the Board has entirely omitted the federal methods designations provisions from the illinois NAAQS regulations.
The requirements of40 C.F.R. 58 prescribetherequirements for establishing, operating, and maintaining monitoring networks and monitoringplans. See 40 C.F.R. 58.2 (2012). While these requirements are essential to implementation oftheNAAQS, none oftheNAAQS tetms depend on anyprovision ofthe monitoring networkrules. Further, as discussed above, the Board believesthat these requirements are implemented in Illinois as a matter offederal law. Finally, USEPA did not cite 42 U.S.C. § 7409 as the basis for adoption ofthese rules. See 40 C.F.R. 58 (2012) (authoritynote); 415 ILCS 5/lO(H), as addedby P.A. 97-945, eff. Aug. 10,2012. For these reasons, the Board entirely omitted the federal ambient air quality monitoring system requirements from the Illinois NAAQS regulations.
The federal defmitions ofair qualitymonitoring areas and attainment designations of these areas are codified in40 C.F.R. 81. In particular, these federal rules define theboundaries ofthe "airquality control regions" (designated areas) in Illinois. See 40 C.F.R. 81.14 (Metropolitan Chicago), 81.18 (Metropolitan St. Louis), 81.69 (Paducah-Cairo Interstate), 81.71 (Rockford-Janesville-Beloit Interstate), 81.98 (Burlington-Keokuk Interstate), 81.101 (Metropolitan Dubuque), 81.102 (Metropolitan Quad Cities), 81.262 (North-Central Illinois Intrastate), 81.263 (East-Central Illinois Intrastate), 81.264 (West-Central Illinois Intrastate), and 81.265 (Southeast Illinois Intrastate) (2012). These regulations further codifyUSEPA's attainment designations for these designated areas. See 81.314 (2012).Many transitional provisions in the federal NAAQS make applicability ofNAAQS depend on the attainment status ofthe vmious designated areas in Illinois. See 40 C.F.R. 50.4(e) (2012) (the 1971 NAAQS for sulfur oxides), 50.9(a) (1997 one-hourNAAQS for ozone), 50.10(c) (1997 24-hourNAAQS for ozone), and 50.12(b) (the 1978 NAAQS for lead) (2102). Even though the applicability oftheseNAAQS directly rely on the federally codified area boundaries and attainment designations codified in 40 C.F.R. 81, the Board has not included any provision ofthese ancillmy rules inthe IllinoisNAAQS rule.
The Board acknowledges the need to monitor future amendments to 40 C.F.R. 81 to dete1mine the applicability ofNAAQS. The Board has used 40 C.F.R. 81 to determine the applicability ofNAAQS for two criteria contaminants: the 1971 plimary 24-hourNAAQS for sulfur oxides and the 1979 primary calendar qumterly average NAAQS for lead. The Board foresees two possible modes for removal ofobsoleteNAAQS from the Illinois rules. The first is USEPAremoval ofthe NAAQS from 40 C.F.R. 50. The second is when the NAAQS no longer applies to any area in this State. See 415 ILCS 5/7.2(a)(l) (2012). Forthis reason, the Board will monitor future amendments to 40 C.F.R. 81 with the same vigilance that the Board will use with regard to theNAAQS codified in 40 C.F.R. 50.
Revisions to USEPA Definitions/Definitions Added
The Board has incorporated the text ofthe federal definitions into the Illinois NAAQS rules. This has involved (I) replacing the former definition-related language of35 Ill. Adm. Code 243.101 with a revised version ofthe preamble to 40 C.F.R. 50.1; (2) changing the meanings ofa small number ofcore definitions to accommodate the context ofthe Illinois regulatory context, adding core definitions as necessary to accommodate those changed meanings; (3) revising several ofthe federal definitions; and ( 4) adding definitions to enhance the clality ofthe rules. Thefollowing paragraphs broadly describe the revisions to the federal definitions. Table I, details the revisions to the federal language.
Shifted Meanings and Revisions to the Preamble. The following bulleted segments describe the changed meanings for te1ms, the definitions added as a result, and the revisions to the preamble statement ofthedefinitions provision.

• The Board changed the meaning ofthe te1m "Act" to mean the Environmental Protection Act (415 ILCS 5 (2012)), rather than the federal Clean Air Act (42 U.S.C. §§ 7401 et seq. (2011)). This change required adding a definition of"CleanAir Act," together with a defined abbreviation "CAA." 9

The Board shifted the meaning ofthe te1m "Agency" to mean the Illinois Environmental Protection Agency, rather than the U.S. Environmental Protection Agency. This shift required adding a definition ofthe abbreviation "USEPA."

9 Adding this definition may not have been necessary, as the te1m "CAA" is used only inthe "Scope"provision of35 Ill. Adm. Code 243.102(a) (derived from 40 C.F.R. 50.2 (2012)), where the Board changed "Act" to "CAA" to retain the meaning ofthe statutory reference. Adding the definition of"CAA" maintains greaterparitybetween the State and federal NAAQS rules.The Board added an affirmative statement ofapplicability ofthe definitions inthe preamble. No such statement exists in 40 C.F.R. 50.1. Rather, the conesponding federal preamble states that the definition ofa term given by the Clean Air Act applies to terms not defined in 40 C.F.R. 50.1.

• The Boardretained the word "Act" in the language drawn from the federal preamble statement in 40 C.F.R. 50.1. The above-described shifted definition of"Act"would change the focus fi"om definitions inthe federal Clean Air Act to those ofthe Illinois Environmental Protection Act were the Board to retain the word "Act." Since the Board perceives that USEPA intended use ofthe Clean Air Act definitions, the Boardhas replaced "Act" with "CAA" in this statement. The Board fu1ther added a reference to the definitions of35 ill. Adm. Code 201.102, which are a segment ofthe general provisions pertinent to the Subtitle B: Air Pollution Control requirements. Changes in Defined Terms. TheBoard has changed a limited number ofthe defined te1ms. The pu!]Joses for the changes are two-fold: (I) to standardize use ofthe te1m and conform the term to its use in the text; and (2) to enhance the clarity ofthe term. The following bulletedpoints describe the changed tenus:
The Board changed "exceedance withrespect to a national ambient air quality standard" to "exceedance ofa NAAQS" for enhanced clarity.
The Board changed "equivalent method" to "federal equivalent method" and added the defined abbreviation "FEM" for consistent use in the text ofthe rules for the reasons previously explained in this opinion and order.
The Board changed "referencemethod" to "federal reference method" and added the defined abbreviation "FRM" for consistentuse inthe text ofthe rules for the reasons previously explained in this opinion and order.
Added Defined Terms. The Board has added a limited number ofdefined terms. The purposes for the additions are two-fold: (I) to standardize use ofthe term in the text ofthe rules; and (2) to enhance the clarity ofthe text. The following bulleted points describe the added defined tenus:
The Board added a defmition ofthe term "micrograms per cubic meter" and the defined abbreviation "f.!g/m3" to enable the use ofthe defmed abbreviation in 35 Ill. Adm. Code 243.124(c) and 243.126(b)(l) and (b)(2) (co1Tesponding with 40 C.F.R. 50.6(a), 50.7(a), and 50.9(a) (2012)), based on the definition ofthe abbreviation in 40 C.F.R. 50.6(a) and 50.7(a) (2012).
The Board added a definition ofthe te1m "milligrams per cubic meter" and the defmed abbreviation "mgfm3" to enable use ofthe defined abbreviation in 35 Ill. Adm. Code 243.124(a)(l) and (a)(2) (based on 40 C.F.R. 50.8(a)(l) and (a)(2) (2012)).The Board added a definition of"National Ambient Air Quality Standard" and the defined abbreviation "NAAQS" to enable use ofthe defined abbreviation inmultiple locations throughout the text of35 Ill. Adm. Code 243. The defmition is based on the definition in "Tenns ofEnvironment: Glossary, Abbreviations, and Acronyms" (December 1997), EPA 175-B-97-001, at 30.

• The Board added a definition ofthe term "pmis perbillion" and the defined abbreviation "ppb" to enable use ofthe defined abbreviation in 35 Ill. Adm. Code 243.122(c)(l) and (c)(2); 243.124(a), (b), and (e); and appendix C to 35 Ill. Adm. Code 243 (2012) (based
on40 C.F.R. 50.15(a) (2012)).

• The Board added a definition ofthe te1m "pmispermillion" and the defined abbreviation "ppm" to enable use ofthe defined abbreviation in 35 Ill. Adm. Code 243.122(a)(l), (a)(2), (b)(l), and (b)(2); 243.123(a)(l), (a)(2), and (d); 243.124(c) and (g); and 243.125(a)(l), (b)(l), (b)(2), and (c)(2) and Appendix C to 35 Ill. Adm. Code 243 (based on40 C.F.R. 50.4(a) and (b), 50.4(a) and (b); 50.8(a)(l), (a)(2), and (d); 50.9(a); 50.10(a) and (b); 50.11(g); 50.14(c); and 50.15(b) (2012)), based onthe definition ofthe abbreviation in 40 C.F.R. 50.4(a) and (b), 50.8(d),; and 50.17(a) (2012).

• The Board added a definition ofthe term "PM 10,''based onthe parenthetical definition in 40 C.F.R. 50.6(c), for the purposes of35 Ill. Adm. Code 243.120(a) (conesponding with 40 C.F.R. 50.6 (2012)).
The Board added a defmition ofthe te1m "PM2.5,"based onthe parenthetical definition in 40 C.F.R. 50.7(a), for the purposes of35 Ill. Adm. Code 243.120(b) and (c) (conesponding with40 C.F.R. 50.7 and 50.13 (2012)).
Omitted Defined Terms. The Board has omitted two ofthe federally defined tenns. The purposes for the omissions are (1) to exclude a tenn that has no present operative effect in Illinois (see 415 ILCS 5/7.2(a)(l) (2012)); and (2) to omit a term thathas been substituted in the text ofthe rules with another term. The following bulletedparagraphs describe the defmitions omitted.

• The Board omitted the federal defmition of"Indian counh-y" from 40 C.F.R. 50.2(i), since no such area that falls within this defmition exists in Illinois.
The Board omitted the defmition of"Administrator," since the te1m "USEPA" is substituted for this tenn throughout the text ofthe rules. See 35 Ill. Adm. Code 243.102 (definition of"exceptional event"; conesponding with 40 C.F.R. 50.l(j)) and 243.102(b) (cmTesponding with40 C.F.R. 50.2(b)).
USEPA Rules Added/State Provisions Removed
The Board removed from the illinois regulations the following provisions that have no cunent direct counterparts in the federal rules:Preamble (35 Ill. Adm. Code 243.102), whichthe Board has replaced with the statement ofscope from 40 C.P.R. 50.2. The recitations ofthe existingpreamble statement are similar in nature to those ofthefederal scope statement. Replacing the State preamble statement withthe federal

**stat~ment** ofscope minimizes thepotential for conflicts between the Illinois and federal NAAQS requirements. Nondegradation (35 Ill. Adm. Code 243.104), whichthe Boardhas removed in its entirety. The federal rules include no direct counterpart to this requirement. Section II0 ofthe federal Clean AirAct (42 U.S.C. 

### § 7410 (2011)), however, includes a requirement that a SIP must not interfere with requirements to prevent significant deterioration (PSD). 10 See 42 U.S.C. § 7410(a)(2)(D)(i)(Il) and (a)(2)(J) (2011). Monitoring (35 Ill. Adm. Code 243.106), whichthe Board has removed in its entirety. The federal NAAQS rules include no direct counterpart to this requirement. Rather, 40 C.P.R. 58 sets fmththe detailed requirements for airmonitoting networks. As is discussed above, the Board has not included requirements from 40 C.P.R. 58 in this proceeding. The Board does not perceive those requirements to bepart ofthe NAAQS, despite the importantrole the air monitoting network rules playin ensuring compliance with theNAAQS.

• Rule into SectionTable and Section into Rule Table (Appendices A and B to 35 Ill. Adm. Code 243), which the Boardhas removed intheir entirety. Those tables cmTelated the numbers ofthe original Illinois airpollution control rules relating to ambient air quality with the numbers ofrules inthe codified version, which arose in 1983. See 7 Ill. Reg. 13630 (Oct. 14, 1983). The Board sees no present need to maintain those listings.
The Board added the following provisions:

• Scope (35 Ill. Adm. Code 243.102), with whichthe Boardreplaced the former preamble statement, as described immediately above.

• Air QualityMonitoting Data InfluencedbyExceptional Events (35 Ill. Adm. Code 243.105 and Table A to 35 Ill. Adm. Code 243), whichthe Board added to CO!Tespond with40 C.P.R. 50.14 (2012) ("Treatment ofair quality monitoring data influenced by exceptional events"). Thisprovision sets forth the procedure for USEPA approval of excluding monitoring data that resulted from an exceptional event. Undertheprocedure, a state flags such data and requests that USEP A excludethat data. Upon an affirmative USEPA detetmination that the data were theresult ofan exceptional event, USEPA will exclude that data from the dete1mination ofcompliance. See 40 C.P.R. 50.14 (2012). The procedure also includes a requirement for public notification ofan event that is expectedto result in exceedance ofanyNAAQS. See 40 C.P.R. 50.14(c)(l) (2012). The term "exceptional event" is defined in 40 C.P.R. 50.1

## Gl as follows:

10 Part C ofthe Clean AirActincludes the federal PSD requirements. See 42 U.S.C. § 7470-92 (2011).(j) Exceptional eventmeans an event that affects air quality, is not reasonably controllable orpreventable, is an event caused byhuman activity that is unlikely to recur at a particular location or a natural event, and is detennined by [USEPA] in accordance with40 CFR50.14 to be an exceptional event. It does notinclude stagnation ofair masses or meteorological inversions, a meteorological event involving high temperatures orlack ofprecipitation, or air pollutionrelating to source noncompliance. 40 C.F.R. 50.I(j) (2012); see (35 III. Adm. Code 243.101); see also 40 C.F.R. 50.l(k) (2012) (definition of"natural event"). Incorporating this provision into the Illinois NAAQS regulations required modification of the federal text. Principally, the Board modified the language to shift from first-person statements ofwhat USEPA will do to third-person statements ofwhat USEPA has said it will do. The Board also added topical sub-headings, "exceptional events," "fireworks displays," and "prescribed fires" for each ofthe categories ofevents considered byUSEPA. See 35 III. Adm. Code 243.105(b)(1), (b)(2), and (b)(3). The Board fiuther omitted expired federal provisions. See 35 III. Adm. Code243.105(c)(2)(D), (c)(2)(E), (c)(3)(B), and (c)(3)(C). Finally, the Board found it necessary to move the tabular material appended to 40 C.F.R. 50.14(c)(2)(vi) into a separate provision. The tabular material appears in new Table A to 35 III. Adm. Code 243. Inclusion ofthe tabular material at con-esponding with 35 III. Adm. Code 243. 105(c)(2)(F) would have required a two-inch left indent and extensive reorganization ofthe material. See 1 III. Adm. Code 1 00.340; Illinois Secretary ofState, Index Department, Administrative Code Division, StyleManual, IllinoisAdministrative Code andIllinoisRegister (June 2004). 11

The Board found it necessary to make minorrevisions to the federal tabular material. First, the Board omitted federal footnotes "a" and "b" relating to federal effective dates from the text, since they would serve no function in the Illinois text. Second, the Board corrected the 2010 one-hourNAAQS for nitrogen oxides from "80-100 PPB, final level TBD"to "100 ppb" and the 2010 one-hourNAAQS for sulfur oxides to "75 ppb." 12 The Board added explanation of both alterations to the Board note appended to TableA to 35 III. Adm. Code 243. Incorporation ofthe NAAQS for the Six Criteria Pollutants

In the following paragraphs, the Board considers the current status ofthe NAAQS associated with each ofthe six prioritypollutants for which USEPA has established one or more

11 Available online at www.cyberdriveillinois.com/publications.

12 This is an apparent en-or in final federal adoption. Compare 75 Fed. Reg. 35520, 92 (June 22, 2010) (adopted version) with 74 Fed. Reg. 64810,69-70 (Dec. 8, 2009) (proposed version); see 75 Fed. Reg. at 35586; 74 Fed. Reg. at 64858 (the table as it appeared in the preamble discussions). The 2010 one-hourNAAQS for nitrogen oxides was pending simultaneous with the 2010 NAAQS for sulfur oxides. See 75 Fed. Reg. 6474 (Feb. 9, 2010) (adoption of2010 NAAQS for nitrogen oxides).NAAQS: carbon monoxide, lead, nitrogen oxides, ozone, particulate matter, and sulfur oxides. 13 Each segment ofdiscussion examines the historical development ofthe NAAQS for the particularpollutant, each notes theNAAQS that remain in 40 C.F.R. 50 for that pollutant, and each explains the Board's approach to each ofthe NAAQS.
Section 243.120: Particulate Matter. USEPA has had three different types of standards for particulate matter, which have depended on the size ofthe particulates to be monitored. The initial standard was for total suspended particulates (TSP), which gauged the total amount ofpm1iculates in the

**a~nbient** air. USEPA then used whathas now been called "PM10," which are the particulates in air having an aerodynamic diameter of 10 microns or less. See 40 C.F.R. 50.6(c) (2012). More recently, USEPA has used "PM25 ," which is also called "finepm1iculates": those having an aerodynamic diameter of2.5 microns or less. See 40 C.F.R. 50.7(a) (2012). The following table summmizes the development oftheNAAQS for pm1iculate matter (indicating curr-ently codified standards in bold):
1971 PrimaryAnnual Average NAAQS for Total Suspended Particulates (TSP) (Removed) Standard: 75 f!g/m3 annual geometric mean Citation: 40 C.F.R. 50.6(a) (1986) (originally42 C.F.R. 410.6(a) (1971)) Aplil30, 1971 (36 Fed. Reg. 8186): 01iginal adoption. November 25, 1971 (36 Fed. Reg. 22384): Recodified without substantive revision. July 

### I, 1987 (52 Fed. Reg. 24634): Removed.
1971 Primary 24-HourNAAOS for Total Suspended Pm1iculates CTSPl (Removed) Standard: 260 f!g/m3 not to be exceeded more than once in a year Citation: 40 C.F.R. 50.6(b) (1986) (originally 42 C.F.R. 41 0.6(b) (1971)) Aplil30, 1971 (36 Fed. Reg. 8186): Original adoption. November 25, 1971 (36 Fed. Reg. 22384): Recodified without substantive reVISIOn. July 

### I, 1987 (52 Fed. Reg. 24634): Removed.
1971 Secondary Annual AverageNAAOS for Total Suspended Pm1iculates CTSPl (Removed) Standard: 60 f!g/m3 used for assessing implementation plans achieving the 1971 secondary 24-hour standard Citation: 40 C.F.R. 50.7(a) (1986) (originally 42 C.F.R. 410.7(a) (1971)) Apiil30, 1971 (36 Fed. Reg. 8186): Original adoption.

13 USEPA adopted primmy and secondaryNAAQS for hydrocarbons in 1971. See 40 C.F.R. 50.10 (1972); 36 Fed. Reg. 8186 (Apr. 30, 1971) (originally codified as 42 C.F.R. 410.10); see also 36 Fed. Reg. 22369, 84 (Nov. 25, 1971) (recodified to 40 C.F.R. 50.10). USEPA removed theNAAQS for hydrocarbons in 1982. See 48 Fed. Reg. 628, 29 (January 5, 1983).

### November 25, 1971 (36 Fed. Reg. 22384): Recodified without substantive revJsJOn. July I, 1987 (52 Fed. Reg. 24634): Removed.
1971 Secondary 24-HourNAAQS for Total Suspended Pmticulates CTSP) (Removed) Standard: !50 )lg/m3 

### not to be exceeded more than once in a year Citation: 40 C.P.R. 50.7(b) (1986) (originally 42 C.P.R. 410.7(b) (1971)) April30, 1971 (36 Fed. Reg. 8186): Original adoption. November 25, 1971 (36 Fed. Reg. 22384): Recodified without substantive revJsJOn. July I, 1987 (52 Fed. Reg. 24634): Removed.
1987 Primarv and Secondarv 24-Honr NAAQS for PM10 (Current) 

### Standard: !50 )lg/m3not to be exceeded more than once per year, on a three-year average basis Citation: 40 C.P.R. 50.6(a) (2012) July I, 1987 (52 Fed. Reg. 24634): Original adoption. July 18, 1997 (62 Fed. Reg. 38652): Sunset provision added. 14 

### December 22, 2000 (65 Fed. Reg. 80776): Sunset provision removed 15


### 1987 Primary and Secondary Annual AverageNAAOS for PM 10 

### (Removed) Standard: 50 )lg/m3 

### annual arithmetic mean on a three-year average basis Citation: 40 C.P.R. 50.6(b) (2006) July I, 1987 (52 Fed. Reg. 24634): Original adoption. July 18, 1997 (62 Fed. Reg. 38652): Sunset provision added. 16 

### December 22, 2000 (65 Fed. Reg. 80779): Sunset provision removed 17 

### October 17,2006 (71 Fed. Reg. 61144): Removed.
1997 P1imary and Secondary Annual AverageNAAQS for PM 10 

### (Removed) Standard: 50 [Lglm3 

### annual arithmetic mean, averaged over three years Citation: 40 C.P.R. 50.7(a)(2) (1998)

14 

### Not described in this surnn1ary outline because USEPA subsequentlyremoved the sunset provision. See 

### 40 C.P.R. 50.6(d) (1998) (the removed sunsetprovision).

15 

### As a result ofthe decision in AmericanTrucking Assoc. v. EPA, 175 F. 2d 1027, modified en bane, 

### 195 F.3d 4 (D.C. Cir. 1999), aff'd inpart and rev 'dinpartsub nom 

### Whitman v. Ame1ican Trucking Assoc., 531 U.S. 457,121 S. Ct. 903,149 L. 

### Ed. 2d 69 (2001), on remand, 

### 283 F.3d 355 (D.C. Cir. 2002).

16 See supra 

### note 14.

17 See supra 

### note 15.July 18, 1997 (62 Fed. Reg. 38652): Original adoption. July 30, 2004 (69 Fed. Reg. 45592): Removed.
1997 Primary and Secondary 24-HourNAAQS for PM10 (Removed)
Standard: 150 [.tg/m3 99th percentile, averaged over tlu·ee years Citation: 40 C.P.R. 50.7(a)(2) (1998) July 18, 1997 (62 Fed. Reg. 38652): Original adoption. July 30, 2004 (69 Fed. Reg. 45592): Removed.
1997 Primarv and Secondarv Annnal Average NAAOS for PM,.s (Current) Standard: 15.0 [.tg/m3arithmetic mean, averaged overthree years Citation: 40 C.P.R. 50.7(a) (2012) (originally40 C.P.R. 50.7(a)(l) (1998)) July 18, 1997 (62 Fed. Reg. 38652): Original adoption. July 30, 2004 (69 Fed. Reg. 45592): Renumbered to subsection (a).
1997 Primarv and Secondarv 24-Hour NAAQS for PM, 5 (Current) Standard: 65 [.tg/m3 98th percentile, averaged over three years Citation: 40 C.P.R. 50.7(a) (20 12) (originally 40 C.P.R. 50.7(a)(l) (1998)) July 18, 1997 (62 Fed. Reg. 38652): Original adoption. July 30, 2004 (69 Fed. Reg. 45592): Renumbered to subsection (a).
2006 Primarv and SecondarvAnnual Average NAAQS for PM,.s (Current) Standard: 15.0 [.tg/m3 arithmetic mean, averaged over three years Citation: 40 C.P.R. 50.13(a) (2012)
October 17, 2006 (71 Fed. Reg. 61144): Original adoption.
2006 Primarv and Secondarv 24-Hour NAAQS for PM, 5 (Current) Standard: 35 [.tg/m3 98th percentile, averaged over tlu·ee years Citation: 40 C.P.R. 50.13(a) (2012)
October 17, 2006 (71 Fed. Reg. 61144): Original adoption.
Five primary and secondaryNAAQS for particulate matter remain codified in tiu·ee federalmles: 40 C.P.R. 50.6, 50.7, and 50.13. There remains one standard for PM 10 and four for PM25

. 18 The Board has codified these five standards in 35 Ill. Adm. Code 243.120. The Board has replaced this patiiculate matter provision with the text ofthe five federal NAAQS. Each of

18 USEPA proposed and declined to adopt a standard for coarse particulate matter (PM 10•2
.5). See the discussion that appears at page 20 ofthis opinion and order.the federal pmticulate matterprovisions appears in a separate subsection, one for each ofthe 1987, 1997, and 2006 standards. The five NAAQS are codified as follows:

Subsection Federal Citation NAAQS 243.120(a) 40 C.F.R. 50.6 1987 primary and secondary 24-hour NAAQS for PM 10 1997 primary and secondary annual average NAAQS for 243.120(b) 40 C.F.R. 50.7 PM2.s 1997 primary and secondary 24-hour NAAQS for PM2

.5 2006 primary and secondary annual average NAAQS for 243.120(c) 40 C.F.R. 50.13 PM2

.5 2006 primmy and secondary 24-hourNAAQS for PM2
.5
The Board does not engage in substantive review offederal standards in the context ofan identical-in-substance proceeding, except as necessary to incmporate them into the illinois air regulations. Persons wishing to understand the substance ofa federal standard should review the FederalRegisternotices bywhich USEPA has adopted, reviewed, and amended the various standards. Those notices are listed inthe foregoing review ofthe federal standards for particulate matter.
The Board has codified the federal NAAQS for pmticulate matter without substantive revision. All ofthe deviations fi·om the literal text ofthe federal NAAQS are itemized in Table 1. The Board discusses here one addition to the federal text: the addition ofexplanation in the Board notes to the 1987 and 1997 standards.
The explanation appended to the 1987 NAAQS for PM 10 outlines how USEPA added a sunset clause to the 1987 PM 10 standards when adopting a revised 1997 standard for PM 10 and the 1997 NAAQS for PM2. 5• See 62 Fed. Reg. 38652, 701 (July 18, 1997). The sunsetprovision stated that the 1987 standards would not applyto an area designated non-attainment with the 1987 standards once USEPA has established rules for non-attainment areas as required by section 172(e) ofthe Clean Air Act (42 U.S.C. § 7502(e) (2011). The sunset provision further stated that the 1987 standards would not apply to an area that had attained those standards after USEPAhas approved a SIP for that area relative to the new 1997 standards. See 40 C.F.R. 50.6(d) (1998).
USEPA laterremoved the 1997 NAAQS for PM 10 and the sunset provision from the 1987 standard as a result ofdecision in American Trucking Assoc. v. EPA, 175 F. 2d 1027, modified
en bane, 195 F.3d 4 (D.C. Cir. 1999), aff'd inpart and rev'd inpart, sub nom Whitman v. AmericanTrucking Assoc., 531 U.S. 457, 121 S. Ct. 903, 149 L. Ed. 2d 69 (2001), on remand, 283 F.3d 355 (D.C. Cir. 2002). See 69 Fed. Reg. 45592 (July 30, 2004); 65 Fed. Reg. 80776, 77(Dec. 22, 2000). As a result, the 1987 plimary and secondary 24-hourNAAQS for PM10 continues to apply. 19 See 65 Fed. Reg. 80776, 77 (Dec. 22, 2000).
The Board has included the 1987 standard for PM10
. The explanation that the Board appended to the 1987 standards explains Board retention ofthe 1987 standards. TheBoard has not included the 1997 NAAQS for PM 10 in the Illinois regulations.
The Boardhas retained the 1997 NAAQS for PM2.5 because USEPA has done so. The 2006 ptimary and secondary annual average NAAQS for PM2.s is nearly the same as the 1997 annual average standard.20 Onthe otherhand, the 2006 prin1ary and secondary 24-hourNAAQS for PM 2.s is more stringent than the 1997 24-hour standard. Compare 40 C.P.R. 50.7(a) (2012) (1997 standard) with 40 C.P.R. 50.13 (2012) (2006 standard); see 71 Fed. Reg. 61144,45, 64 (Oct. 17, 2006). Further, it appears that the 1997 standards for PM2.s may have continuing vitality for implementation ofvarious federal ambient air quality mles. See 71 Fed. Reg. 61144, 49 (Oct. 17, 2006). The explanation appended to the 1997 NAAQS for PM2.5 outlines USEPA's addition ofthe 2006 annual average and 24-hourNAAQS for PM2

_ 5 and Board retention ofthe 1997 standard.
Section 243.122: Sulfur Oxides. USEPA has maintained primary and secondary NAAQS for sulfur oxides since 1971. The following table summarizes the development ofthe NAAQS for sulfur oxides (indicating currently codified standards in bold):
1971 Primarv Annual Average NAAOS for Sulfur Oxides (as SO,) (Subject to Sunset) Standard: Citation: 0.030 ppm annual arithmetic mean 40 C.P.R. 50.4(a) (20 12) (originally 42 C.F.R. 41 0.4(a) (1971)) April30, 1971 (36 Fed. Reg. 8186): Original adoption as 80 J.tg/m3 (0.03 ppm). November 25, 1971 (36 Fed. Reg. 22369, 84): Recodified without substantive reVISIOn. April21, 1993 (58 Fed. Reg. 21351): Retained without revision. May 22, 1996 (61 Fed. Reg. 25566): Immaterial change to 0.030 ppm (significant digit added, metric units removed). June 22,2010 (75 Fed. Reg. 35520): Sunset provision added: the standard does not applyto an area one year after USEPA designation ofthe attainment status ofthat area under the 2010 primary one-hour standard, with exceptions.
1971 Primarv 24-Hour NAAOS for Sulfur Oxides (as S02 ) (Subject to Sunset) Standard: 0.14 ppm not to be exceeded more than once peryear

19 USEPAretained the 24-hour 1987 NAAQS and removed the annual average 1987 NAAQS in 2006. See 71 Fed. Reg. 61144 (Oct. 17, 2006).

20 USEPA kept the numerical standard the same, but revised the monitoring and data handling conventions for detennining compliance. See 71 Fed. Reg. 61144, 77, 210-11 (Oct. 17, 2006).

### Citation: 40 C.F.R. 50.4(b) (2012) (originally42 C.F.R. 4!0.4(b) (1971)) April 30, 1971 (36 Fed. Reg. 8186): Original adoption as 365 !lg/m3 

### (0.14 ppm). November 25, 1971 (36 Fed. Reg. 22369, 84): Recodified without substantive reVISIOn. Ap1il 21,1993 (58 Fed. Reg. 21351): Retained without revision. May 22, 1996 (61 Fed. Reg. 25566): Immaterial change to 0.14 ppm (metJ.ic units removed). June 22, 2010 (75 Fed. Reg. 35520): Sunset provision added: the standard does not apply to an area one year afterUSEPA designation ofthe attainment status ofthat area under the 2010 primary one-hour standard, with exceptions.
1971 Secondary Annual Average NAAQS for Sulfur Oxides (as SO,) (Revoked) Standard: 60 !lg/m3 

### (0.02 ppm) annual mithmetic mean Citation: 40 C.F.R. 50.5(a) (1972) (originally 42 C.F.R. 4!0.5(a) (1971)) April 30, 1971 (36 Fed. Reg. 8186): Original adoption. November 25, 1971 (36 Fed. Reg. 22369, 84): Recodified without substantive revJsJOn. September 14, 1973 (36 Fed. Reg. 25678): Revoked.
1971 Secondary 24-HourNAAQS for Sulfur Oxides (as SO,) (Revoked) Standard: 260 !lg/m3 

### (0.1 ppm) not to be exceeded more than once per year Citation: 40 C.P.R. 50.5(b) (1972) (originally 42 C.F.R. 4!0.5(b) (1971)) April 30, 1971 (36 Fed. Reg. 8186): Original adoption. November 25, 1971 (36 Fed. Reg. 22369, 84): Recodified without substantive reVISIOn. September 14, 1973 (36 Fed. Reg. 25678): Revoked.
1971 Secondarv Three-Hour NAAOS for Sulfur Oxides (as S02) (Current) 

### Standard: 0.5 ppm not to be exceeded more than once per year Citation: 40 C.F.R. 50.5 (2012) (originally 42 C.F.R. 410.5(c) (1971), then 40 C.P.R. 50.5(c) (1972)) April30, 1971 (36 Fed. Reg. 8186): Original adoption as 1300 !lg/m3 

### (0.5 ppm). November 25, 1971 (36 Fed. Reg. 22369, 84): Recodified without substantive revision. September 14, 1973 (36 Fed. Reg. 25678): Renumbered. May 22, 1996 (61 Fed. Reg. 25566): Immaterial change to 0.5 ppm (metric units removed).
2010 Primarv One-Hour NAAOS for Sulfur Oxides (as SO,) (Current) 

### Standard: 7 5 ppb 99th percentile, averaged over three years Citation: 40 C.F.R. 50.17(a) (2012) (originally 42 C.F.R. 410.4(a) (1971))June 22,2010 (75 Fed. Reg. 35520): Original adoption.
Three primary and one secondaryNAAQS for sulfur oxides remain codified in three federalmles: 40 C.F.R. 50.4, 50.5, and 50.17. The Boardhas codified these four standards in 35 Ill. Adm. Code 243.122. The Board has replaced the existing sulfur oxides provision with the text ofthe federal NAAQS. Each ofthe federal sulfur oxides provisions appears in a separate subsection. The four NAAQS for sulfur oxides are codified as follows:

Subsection Federal Citation NAAQS 243.122(a)(1) 40 C.F.R. 50.4(a) 1971 primary annual averageNAAQS for sulfur oxides 243.122(a)(2) 40 C.F.R. 50.4(b) 1971 primary 24-hourNAAQS for sulfur oxides

243.122(b) 40 C.F.R. 50.5 1971 secondarythree-hourNAAQS for sulfur oxides 243.122(c) 40 C.F.R. 50.17 2010 primmy one-hourNAAQS for sulfur oxides

As previously discussed, the Board does not engage in substantive review offederal standm·ds inthe context ofan identical-in-substance proceeding, except as necessaryto incorporate them into the illinois air regulations. Persons wishing to understand the substance of a federal standard should review the

### FederalRegisternotices bywhich USEPA has adopted, reviewed, and amended the various standards. Those notices are listed in the foregoing review ofthe federal standards for sulfur oxides.
The Board has codified the federal NAAQS for sulfur oxides without substantive revision. All ofthe deviations from the literal text ofthe federal NAAQS are itemized in Table 1. The Board discusses here only one issue relative to the federal NAAQS for sulfur oxides: USEPA addition ofa sunsetprovision to the 1971 primary annual average and 24-hourNAAQS for sulfur oxides with adoption ofthe 2010 primaryNAAQS for sulfur oxides.


### Sunset Clause (or the 1971 Primary 24-HourNAAOS (or Sulfur Oxides. Upon adoption ofthe 2010 primmy one-hourNAAQS for sulfur oxides, USEPA added the following sunset clause:
The [1971 primmy annual average and 24-hour] standards [for sulfur oxides] set fmth in this section will remain applicable to all areas notwithstanding the promulgation of[the2010] 

## so2 [primary] national ambient air quality standards (NAAQS) [for sulfur oxides] in§ 50.17. The [1971 primary annual average and 24-hour] S02 NAAQS set forth in this section will no longer applyto an area one year after the effective date ofthe designation ofthat area, pursuant to section 107 ofthe Clean AirAct, for the [201 0] S02NAAQS set forth in§ 50.17; except that for areas designated nonattainment for the [1971 primary annual average and 24- hour] S02NAAQS set forth in this section as ofthe effective date of§ 50.17, and areas not meeting the requirements ofa SIP call withrespect to requirements forthe [1971 primary annual average and 24-hour] S02NAAQS set forth inthis section, the [1971 primary annual average and 24-hour] S02 NAAQS set forth in this section will apply until that area submits, pursuant to section 191 ofthe Clean Air Act [42 U.S.C. § 7514], and EPA approves, an implementation plan providing for attaimnent ofthe [2010] S02 NAAQS set forth in§ 50.17. 40 C.F.R. 50.4(e) (2012); 75 Fed. Reg. 35520, 92 (June 22, 2010).
The Board sees various altematives for codifying tllis provision. One basic change would apply to all ofthe altematives: changing "the effective date of§ 50.17" to "August 23, 2010." See 75 Fed. Reg. 35520 (June 22, 2010). Application ofother segments ofthis sunset provision to areas ofIllinois is more problematic.
The Board cannot defnlitively determine whether the 1971 primary annual average and 24-hourNAAQS for sulfur oxides apply to any area ofthe State. Although the federal regulations make it clear that USEPA had not designated any area in Illinois as non-attaimnent as ofAugust 23, 2010 (see 40 CFR 81.314 (201 0)), the federal regulations do not make it clear that no area was "not meeting the requirements ofa SIP call with respect to requirements for the [1971 primary annual average and 24-hour] S02 NAAQS" as ofthat date (see 40 C.F.R. 52.720, 52,722, and 52.724 (20 12)). The Board was able to determine that USEPA had notmade any attaimnent detenninations with regard to the 2010 primary one-hourNAAQS for sulfur oxides as ofDecember 31, 2012. See 40 C.F.R 81.314 (2012); List of SectionsAffected (December 2012), at 82; 77 Fed. Reg. 48062, 71 (Aug. 13, 2012) (pertaining only to ozone). Itis apparent, however, that the Agency has recommended area designations for Illinois to USEPA. See letter ofJune 2, 2011 from Laurel Kroack, Chief, Bureau ofAir, Agency, to Che1yl A. Newton, Director, Office ofthe Air and Radiation Division, USEPA Region 5 (available at http:/ /www.epa.gov/so2designations/recletters/R5

_IL_rec
_wtechanalysis.pdf).
After USEPA has made area designations underthe 2010 one-hourNAAQS for sulfur oxides for each area ofIllinois, and after USEPA has approved an implementation plan for attaimnent for each area ofIllinois, the 1971 primaryNAAQS for sulfur oxides will become obsolete as to Illinois. Until that time, the Board must maintain a provision to conespond with the sunset provision of40 C.F.R. 50.4(e) at 35 Ill. Adm. Code 243.122(a)(5). The Board outlines five options and selects one in the following paragraphs. Option 1: Retain theEntire Federal Text with MinimalDeviation. The first option is for the Board to retain the entire text of40 C.F.R. 50.4(e) withminimal deviation. In addition to the routine clarifying revisions, this altemative reorganizes the material bymoving the two exception statements ofareas where the 1971 p1imary annual average and 24-hourNAAQS will continue to apply into subsidiary subsections. This first option would add an explanatmy Board note to the text. This first option would appear as follows: 5) The 1971 primary annual average and 24-hourNAAQS for sulfur oxides set fmth in this subsection (a) remain applicable to all areas notwithstanding the promulgation ofthe 2010 primary one-hourNAAQS for sulfur oxides in subsection (c) ofthis Section. The 1971 primary annual average and 24-hour NAAQS for sulfur oxides set forth in this subsection (a) will no longer apply to anarea one year afterthe effective date ofthe designation ofthat area byUSEPA pursuant to 42 USC 7407 for the 2010 primary one-hourNAAQS for sulfur oxides set fm1h in subsection (c) ofthis Section; except that the 1971 primary annual average and 24-hourNAAQS for sulfur oxides set forth in this subsection (a) will apply until USEPA has approved an implementation plan for that area pursuant to 42 USC 7514 for attainment ofthe 2010 primary one-hourNAAQS for sulfur oxides set fm1h in subsection (c) ofthis Section for the following areas: A) Areas that USEPA has designated nonattainment for the 1971 primary annual average and 24-hourNAAQS for sulfur oxides set forth in this subsection (a) as ofAugust 23, 2010; and B) Areas that had not met the requirements ofUSEPA a SIP call with respect to requirements for the 1971 primary annual average and 24-hourNAAQS for sulfur oxides set fm1h inthis subsection (a).
BOARD NOTE: The Board substituted "August 23, 20I0" for the open-ended language in corresponding 40 CFR50.4(e) relative to the effective date of40 CFR 50.17. August 23,2010 is the effective date recited at 75 Fed. Reg. 35520 (June 22, 201 0). The Agencyrecommended that USEPA designate limited areas of Illinois as non-attainment with the 2010 p1imary one-hourNAAQS for sulfur oxides. See letter ofJune 2, 2011 from Laurel Kroack, Chief, Bureau ofAir, Agency, to Cheryl A. Newton, Director, Office ofthe Air and Radiation Division, USEPA Region 5 (available at http://www.epa.gov/so2designations/recletters/ R5_IL _rec
_wtechanalysis.pdf). USEPA had not designated any area ofIllinois for the 2010 primary one-hourNAAQS for sulfur oxides as ofDecember 31, 2012. See 40 CFR 81.314 (area designations in Illinois). When the conditions of this subsection (a)(5) havebeen fulfilled, or USEPA has removed 40 CFR 50.4, the Board will remove the standard ofthis subsection (a) as obsolete. 

### Option 2: Replace the Statemento(lnapplicabilitv andDelete OneException Statement The second option is for the Board to retain the text of40 C.F.R. 50.4(e) that states the continued applicability ofthe 1971 primary annual average and 24-hourNAAQS for sulfur oxides. This option, however, would replace the two conditional statements. First, a statement that the Board will remove the 1971 NAAQS when the conditions of40 C.F.R. 50.4(e) have been fulfilled would replace the federal statement when the 1971 primary NAAQS will no longer apply. Second, this option would delete the exception statement relative to areas designated as non-attainment with the 1971 standards. This second option would add the same explanatory Boardnote to the text as would the first option. This second option would appear as follows (with the Board note omitted): 5) The 1971 primary annual average and 24-hourNAAQS for sulfur oxides set forth in this subsection (a) remains applicable to all areas notwithstanding the promulgation ofthe 2010 primaryNAAQS for sulfur oxides in subsection (c) of this Section. The Board will delete the 1971 primary annual average and 24-hour NAAQS for sulfur oxides set fm1h in this subsection (a) after fulfillment oftheconditions recited by USEPA in con·esponding 40 CFR50.4(e) pursuant to 42 USC 7407 for the 2010 primary one-hourNAAQS for sulfur oxides set fmth in subsection (c) ofthis Section; except that the 1971 ptimmy annual average and 24-hourNAAQS for sulfur oxides set forth inthis subsection (a) will apply until USEPA has approved an implementation plan for that area pursuant to 42 USC 7514 for attainment ofthe 2010 primary one-hourNAAQS for sulfur oxides set forth in subsection (c) ofthis Section. 

### Option 3: Replace the Statement o(lnapplicabilitv with aStatement That the Board WillRemove the 1971 NAAOS When ConditionsAreFulfilled. The third option is for the Board to replace the text of40 C.F.R. 50.4(e) with a statement that Board will remove the 1971 primm·y annual average and 24-hourNAAQS for sulfur oxides after fulfillment ofthe conditions recited in40 C.F.R. 50.4(e). This option would describe whenthe 1971 NAAQS no longer apply and the two associated conditional statements in an appended Board note. This third option would appear as follows: 5) The 1971 primary annual average and 24-hourNAAQS for sulfur oxides set forth · in this subsection (a) remains applicable to all areas notwithstanding the promulgation ofthe 2010 primary one-hourNAAQS for sulfur oxides in subsection (c) ofthis Section. TheBoard will delete the 1971 primary annual average and 24-hourNAAQS for sulfur oxides set fmth in this subsection (a) after fulfillment ofthe conditions recited byUSEPA in con-esponding 40 CFR 50.4(e).
BOARD NOTE: Con-esponding 40 CFR 50.4(e) recites that the 1971 primary NAAQS for sulfur oxides remains effective in two types ofareas for which USEPA has not yet approved an implementationplan for attainment with the 2010 primary one-hourNAAQS for sulfur oxides. The first type ofarea is one that USEPA had designated as non-attainment for that standard as ofthe effective date ofthe 2010 primary one-hourNAAQS for the 1971 primaryNAAQS for sulfur oxides as ofthe effective date ofthe 2010 NAAQS. That date was August 23,2010. See 75 Fed. Reg. 35520 (June 22, 2010). As ofthatdate, USEPAhad not designated any area in Illinois as non-attaimnent. See 40 CFR 81.314 (2010). The Board is unaware ofanyUSEPA SIP call for any area ofIllinois relative to the 1971 primaryNAAQS for sulfur oxides. As ofDecember 31, 2012, USEPA had not yet designated the attainment status ofareas in Illinois. See40 CFR 81.314 (2012). TheAgencyrecommended that USEPA designate limited areas of Illinois as non-attaimnent with the 2010 ptimary one-hourNAAQS. See letter of June 2, 2011 from Laurel Kroack, Chief, Bureau ofAir, Agency, to Cheryl A. Newton, Director, Office ofthe Air and Radiation Division, USEPA Region 5 (available at http://www.epa.gov/so2designations/recletters/ R5_IL_rec_wtechanalysis.pdf). Whenthe conditions ofthis subsection (a)(5) have been fulfilled, orUSEPA has removed 40 CFR 50.4, the Board will remove the standard ofthis subsection (a) as obsolete. 

### Option 4: Replace the Statemento(lnapplicabilitv with a Statement That theBoard WillRemove the 1971 NAAOS When USEPA MakesArea Designations Under the 2010 One

### HourNAAQS orRemoves the 1971NAAQS. The fourth option is a variation ofthe third option. This fomth option is for the Board to replace the text of40 C.F.R. 50.4(e) with a statementthat Board will remove the I971 p1imary annual average and 24-hourNAAQS for sulfur oxides after USEPA has made areas designations for all areas in Illinois under the 20I0 primary one-hourNAAQS for sulfur oxides or after USEPA has removed the standard of40 C.F.R. 50.4. This option would describe when the 1971 NAAQS no longer apply and the two associated conditional statements in an appended Board note. This second option would add the same explanatoryBoardnote to the text as would the third option. This fourth option would appear as follows (with the Board note omitted): 5) The 1971 p1imary annual average and 24-hourNAAQS for sulfur oxides set fmth in this subsection (a) remain applicable to all areas notwithstanding the promulgation ofthe 2010 primary one-hourNAAQS for sulfur oxides in subsection (c) ofthis Section. The Board will delete the 1971 primmy annual average and 24-hourNAAQS for sulfur oxides set forth in this subsection (a) after USEPA has made attainment designations with regard to all areas in Illinois under the 20I0 primary one-hourNAAQS for sulfur oxides or USEPAhas removed the existing standard of40 CFR 50.4. 

### Option 5: Remove theSunsetProvision in Its Entiretv. The fifth option would involve removing the sunset clause in its entirety. The sunset provision operates to eclipse the 1971 primaryNAAQS as a matter offederal law. When it is clear that all ofthe conditions have been fulfilled, or ifUSEPAremoves 40 C.F.R. 50.4, the Board can simplyremove 35 III. Adm. Code 243.122(a). The omission ofthe sunset clause in its entirety does not affect the fact that Board removal ofsubsection (a) will be required to remove the 1971 prima1y annual average and 24- hourNAAQS from the Illinois regulations.


### Selection of Option 3. The Boardhas adopted the third option described above and replaces the conditioned statement ofinapplicability of40 C.F.R. 50.4(e) with a statement that the Board will remove the 1971 primaryNAAQS after fulfillment ofthe federal conditions. Option 3 preserves the statement ofapplicability. Option 3 is consistent with the Board's identical-in-substance mlemakingpractice to maintain a provisionuntil the Board removes it. Option 3 avoids the convoluted conditional statement and its exceptions. Whether the conditions are fulfilled is best determined between USEPA and the Agency.
The Board has requested that the Agency infom1 the Board in the future should USEPA detennine that the 1971 prin1aryNAAQS for sulfur oxides do not applyto any area ofIllinois. The Agency stated at hearing that the USEPA area designations are now overdue. Tr. at 10-11. The Board can list areas ofinapplicability in future updates to theNAAQS and ultimately remove 35 III. Adm. Code 243.122(a) when the 1971 Standards no longer apply to any area of the State.
Section 243.123: Carbon Monoxide. USEPA adopted primary and secondary NAAQS for sulfur oxides in 1971. 

### See 36 Fed. Reg. 8186 (Apr. 30, 1971). Each ofthe primary and secondaryNAAQS included two standards: an eight-hour standard and a 24-hour standard.Today, onlythe primary standards remain. The evolution ofthe federal NAAQS for carbon monoxide is outlined as follows (indicating the cmTently codified standards in bold):
1971 Primarv Eight-Hour NAAf!S for Carbon Monoxide (Current) Standard: 9 ppm (I0 mg/m)not to be exceeded more than once per year Citation: 40 C.P.R. 50.8(a)(l) (2012) (01iginally 42 C.P.R. 410.8(a) (1971), then 40 C.P.R. 50.8(a) (1972)) April30, 1971 (36 Fed. Reg. 8186): Original adoption as 10 mg/m3 (9 ppm). November 25, 1971 (36 Fed. Reg. 22369, 22384): Recodified without substantive reVISIOn. February 18, 1975 (40 Fed. Reg. 7042): Amended to require the use offederally approved monitoring methods (FRMs and FEMs). September 13, 1985 (50 Fed. Reg. 37484): Immaterial change to 9ppm (10 11g/m3), renumbered to subsection (a)(!). August I, 1994 (59 Fed. Reg. 38906): Retained without revision. August 31, 20II (76 Fed. Reg. 54294): Retained without revision.
1971 Secondary Eight-HourNAAOS for Carbon Monoxide (Revoked) Standard: 9ppm (I0 mg/m3) not to be exceeded more than once per year Citation: 40 C.P.R. 50.8(a) (1985) (01iginally 42 C.P.R. 410.8(a) (1971)) April30, 1971 (36 Fed. Reg. 8186): Original adoption as 40 mg/m3 (35 ppm). November 25, 1971 (36 Fed. Reg. 22369, 84): Recodified without substantive revision. February 18, 1975 (40 Fed. Reg. 7042): Amended to require the use offederally approved monitoring methods (FRMs and FEMs). September 13, 1985 (50 Fed. Reg. 37484): Revoked.
1971 Primarv One-Hour NAAQS for Carbon Monoxide (Current) Standard: 35 ppm (40 mg/m3 ) not to be exceeded more than once per year Citation: 40 C.P.R. 50.8(a)(2) (2012) (originally42 C.P.R. 410.8(b) (1971), then 40 C.P.R. 50.8(b) (1972)) April30, 1971 (36 Fed. Reg. 8186): Original adoption as 10 mg/m3 (9 ppm). November 25, 1971 (36 Fed. Reg. 22369, 22384): Recodified without substantive reVISIOn. February 18, 1975 (40 Fed. Reg. 7042): Amended to require the use offederally approved monitoring methods (FRMs and FEMs). September 13, 1985 (50 Fed. Reg. 37484): Immaterial change to 9 ppm (I0 11g/m3), renumbered to subsection (a)(2). August I, 1994 (59 Fed. Reg. 38906): Retained without revision. August 31, 20!1 (76 Fed. Reg. 54294): Retained without revision.
1971 Secondary One-HourNAAQS for Carbon Monoxide (Revoked) Standard: 35 ppm ( 40 mg/m3) not to be exceeded more than once per yearCitation: 40 C.F.R. 50.8(b) (2012) (originally 42 C.F.R. 410.8(b) (1971)) April30, 1971 (36 Fed. Reg. 8186): Original adoption as 40 mg/m3 (35 ppm). November 25, 1971 (36 Fed. Reg. 22369, 22384): Recodified without substantive rev1s10n. February 18, 1975 (40 Fed. Reg. 7042): Amended to require the use offederally approved monitoring methods (FRMs and FEMs). September 13, 1985 (50 Fed. Reg. 37484): Revoked.
Two primaryNAAQS for carbon monoxide remain codified in one federal regulation: 40 C.F.R. 50.8. These are a one-hourNAAQS and an eight-hourNAAQS. TheBoardhas codified the two standards in 35 Ill. Adm. Code 243.123. TheBoard has replaced the existing provision relative to carbon monoxide withthe text ofthe federal NAAQS. The single federal provision relative to carbon monoxide appears in a single subsection ofthe Illinois rules. Thetwo NAAQS are codified as follows:

Subsection
243.123(a)(l)

243.123(b)(2) Federal Citation

40 C.F.R. 50.8(a)(l)

40 C.F.R. 50.8(a)(2) NAAQS
1971 primary eight-hour NAAQS for carbon monoxide
1971 primaryone-hourNAAQS for carbon monoxide

The Board does not engage in substantive review offederal standards in the context ofan identical-in-substance proceeding, except as necessary to incorporate them into the Illinois air regulations. Persons wishing to understand the substance ofa federal standard should review the FederalRegisternotices bywhich USEPA has adopted, reviewed, and amended the various standards. Those notices are listed in the foregoing review ofthe federal standards for carbon monoxide in the initial pmtionofthis discussion.
The Boardhas codified the federal NAAQS for carbon monoxide without substantive rev1s10n. All ofthe deviations from the literal text ofthe federal NAAQS are itemized in Table 1.
Section 243.124: Nitrogen Oxides. USEPA adopted primary and secondary annual averageNAAQS for nitrogen oxides in 1971. See 36 Fed. Reg. 46246 (Oct. 5, 1978). USEPA recently adopted a 2010 primary one-hourNAAQS for nitrogen oxides. The evolution ofthe NAAQS for nitrogen oxides was as follows (indicating all ofthe standards as cmTently codified in bold):
1971 Primarv Annual Average NAAf?S for Nitrogen Oxides (as N02) (Current) Standard: 0.053 ppm (I00 [J.g/m ) annual arithmetic mean Citation: 40 C.F.R. 50.ll(a) (2012) (originally 42 C.F.R. 410.11 (1971)) April30, 1971 (36 Fed. Reg. 8186): Original adoption as 100 [J.g/m3 (0.05 ppm).

### November 25, 1971 (36 Fed. Reg. 22369, 22384): Recodified without substantive revision. June 19, 1985 (50 Fed. Reg. 25532): Changed to a separate primaryNAAQS and renumbered subsection (a) with immaterial change to 0.053 ppm (100 flg/m3) 

### (significant digit added, metric and non-metric units switched). October 8, 1996 (61 Fed. Reg. 52852): Retained without revision. Febmary 9, 2010 (75 Fed. Reg. 6474): Retained with immaterial change to 53 ppb (units changed, metric units removed).
1971 Secondarv Annual AverageNAAQS for Nitrogen Oxides (as N0 1) 

### (Current) Standard: 0.053 ppm (1 00 flg/m3 ) annual arithmetic mean Citation: 40 C.P.R. 50.11(c) (2012) (originally42 C.P.R. 410.11 (1971), then40 C.P.R. 50.11 (1972) and 40 C.P.R. 50.ll(b) (1985)) April30, 1971 (36 Fed. Reg. 8186): Original adoption as a primary and secondaryNAAQS of100 flg/m3 

### (0.05 ppm). November 25, 1971 (36 Fed. Reg. 22369, 84): Recodified without substantive reVISIOn. June 19, 1985 (50 Fed. Reg. 25532): Changed to a separate secondary NAAQS and renumbered subsection (b) with immaterial change to 0.053 ppm (100 f!g/m3) 

### (significant digit added, metric and non-metric units switched). October 8, 1996 (61 Fed. Reg. 52852): Retained without revision. Febmary 9, 2010 (75 Fed. Reg. 6474): Retained without revision; renumbered subsection (c).
2010 Primarv One-Hour NAAQS for Nitrogen Oxides (as NOz) (Current) Standard: 100 ppb three-year average ofthe annual 98th percentile ofthe daily maximum one-hour average concentration Citation: 40 C.P.R. 50.11(b) (2012) Febmary 9, 2010 (75 Fed. Reg. 6474): Original adoption.
Two primary and one secondaryNAAQS for nitrogen oxides are codified in one federal mle: 40 C.P.R. 50.11. The Board has codified the two 1971 standards in 35 Ill. Adm. Code 243.124. The Boardhas replaced the existing provision with the text ofthe three federal NAAQS, adding the 2010 primary 24-hourNAAQS for nitrogen oxides to the text. Each ofthe federal provisions relative to nitrogen oxides appears in a separate subsection, with the subsection for each ofthe standards. Thethree NAAQS for nitrogen oxides are codified as follows:

Subsection Federal Citation NAAQS 243.124(a) 40 C.P.R. 50.1l(a) 1971 primary annual average NAAQS for nitrogen oxides243.124(b) 40 C.P.R. 50.ll(b)
243.124(c) 40 C.P.R. 50.5 2010 primary 24-hour NAAQS for nitrogen oxides
1971 secondary annual averageNAAQS for nitrogen oxides

The Board does not engage in substantive review offederal standards inthe context ofan identical-in-substance proceeding, except as necessary to incorporate them into the Illinois air regulations. Persons wishing to understand the substance ofa federal standard should review the FederalRegisternotices bywhich USEPA has adopted, reviewed, and amended the various standards. Those notices are listed in the foregoing review ofthe federal standards for nitrogen oxides in the initial pmtion ofthis discussion.
The Board has codified the federal NAAQS for nitrogen oxides without substantive rev1s1on. All ofthe deviations fi·om the literal text ofthe federal NAAQS are itemized in Table I.


### Section 243.125: Ozone. USEPA adopted the initial primary and secondary one-hour NAAQS for photochemical oxidants21 in 1971. USEPA superseded that primary and secondary one-hour standard in 1979 with a standard for ozone. USEPA established a primary and secondary eight-hour standard for ozone in 1997 and a more stringent eight-hour standard in 2008. The evolution oftheNAAQS for ozone is summarized as follows:
1971 Primary and Secondary One-HourNAAQS for Total Photochemical Oxidants (O.lJ (Removed) Standard: 0.08 ppm not to be exceeded more than one hour per year Citation: 40 C.P.R. 50.9 (1972) (originally 42 C.P.R. 410.9 (1971)) April30, 1971 (36 Fed. Reg. 8186): Original adoption as 160 11g/m3 (0.08 ppm). November 25, 1971 (36 Fed. Reg. 22369, 22384): Recodified without substantive reVISIOn Febmary 18, 1975 (40 Fed. Reg. 7042): Amended to require the use offederally approved monitoring methods (FRMs and FEMs). Febmary 8, 1979 (44 Fed. Reg. 8202): Removed
1979 Primruy and Secondary One-HourNAAQS for Ozone (OJ) (Revoked as to All Areas in Illinois) Standard: 0.12 ppm not to be exceeded more than one dayper year Citation: 40 C.P.R. 50.9(a) (2012)

21 Photochemical oxidants are pollutants fmmed in the ahnosphere bythe reaction ofnitrogen oxides withhydrocarbons. USEPA, Communications, Education, and Public Affairs, Terms of Environment: Glossmy, Abbreviations, andAcronym (Dec. 1997), EPA 175-B-97-001, at 35. Ozone is the principal photochemical oxidant. Others are nitr·ogen dioxide, peroxyacetyl nitrates, fmmaldehyde, acrolein, and organic peroxides. See Proposed Air Quality Standards, R72-7 (July 10, 1975), slip op. at 23-24.Febmary 8, 1979 (44 Fed. Reg. 8202): Original adoption as 0.12 ppm (235 f.tg/m\ March 9, 1993 (58 Fed. Reg. 13008): Retained without revision. July 18, 1997 (62 Fed. Reg. 38856): Sunset provision added: the standard does not apply to an area after USEPA has designated that the area has attained the 1979 primary and secondary onehour standard. July 20, 2000 (65 Fed. Reg. 45182): Sunset provisionrevised: the standard does not applyto an area once the 1997 primary and secondary eighthour standard is effective and is no longer subject tojudicial review, and after USEPA has designated that the area has attained the 1979 primary and secondary onehour standard.22 April30, 2004 (69 Fed. Reg. 23951): Sunset provisionrevised: the standard does not apply to an area one year after USEPA has designated the attainment status ofthe area under the 1997 primary and secondary one hour standard.23 August 3, 2005 (70 Fed. Reg. 44470): Note added to the one-hour ozone attainment designation table in 40 C.F.R. 81.314 stating that the 1979 one-hourNAAQS for ozone was revoked effective June 15, 2005.
1997 Primarv and Secondarv Eight-Hour NAAQS for Ozone (03) (Subject to Partial Sunset) Standard: 0.08 ppm annual fourth-highest daily maximum, averaged overthree years Citation: 40 C.F.R. 50.1 O(a) (2012) July 18, 1997 (62 Fed. Reg. 38856): Original adoption. May21, 2012 (77 Fed. Reg. 30160, 30170): Partial sunsetprovisionadded: 24 the 1997 primary and secondary eight-hour standard will no longer

22 This modification was a result oftheAmerican TruckingAssoc. litigation. See supra note 14. Bythis action, USEPA further amended 40 C.F.R. 81.314 to remove an earlier detetmination that the 1997 primary and secondary one-hourNAAQS for ozone does not applyto areas that were in compliance with the standard. See 65 Fed. Reg. 45182, 83,220-22 (July20, 2000); see also 63 Fed. Reg. 31014,41-42 (June 5, 1998) (reinstating original detetmination of inapplicability); 63 Fed. Reg. 11842,47 (Mar. II, 1998) (withdrawing original determination of inapplicability); 63 Fed. Reg. 2726,48-49 (Jan. 16, 1998) (original detetmination of inapplicability).

23 USEPA simultaneously designated the attainment status ofall areas ofIllinois for the 1997 eight-hourNAAQS for ozone, effective June 15, 2012. See 69 Fed. Reg. 23858 (Apr. 30, 2004).

24 The 1997 primary and secondary eight-hour standard continues to apply for all otherpurposes. See 40 C.F.R. 50.!0(c)(2012). USEPA explained that the 2008 eight-hour standard replaced the 1997 eight-hour standard, butthe 1997 standard has beenretained for implementation purposesapply to an area for transpmtation confmmitypurposes only one year after USEPA has made a designation ofthe area for the 2008 primary and secondary eight-hour standard.
2008 Primarv and SecondarvEight-Hour NAAQS for Ozone (0,) (Current) Standard: 0.075 ppm annual fourth-highest daily maximum, averaged over three years Citation: 40 C.F.R. 50.15(a) (2012)
March 27,2008 (73 Fed. Reg. 16483): Original adoption.
Three primary and secondaryNAAQS for ozone are codified in three federalmles: 40 C.F.R. 50.9, 50.10, and 50.15. The Board has codified the 2008 primary and secondary eighthourNAAQS for ozone in 35 Ill. Adm. Code 243.125. The Board has replaced the existing provision relative to ozone with the text ofthe federal NAAQS, adding the 1997 primary and secondary eight-hourNAAQS to the text. Each ofthe still-applicable federal provisions relative to ozone appears in a separate subsection, with the subsection for each ofthe standards.
The Board included the 1979 primary and secondary one-hourNAAQS for ozone in the May 16, 2013 proposal for public comment, butremoves that standard from the adopted version ofthe mles. Forthe reasons stated below, the Board has determined that it is not necessaryto include the 1979 NAAQS. The two NAAQS for ozone are codified as follows:

Subsection Federal Citation NAAQS 243.125(a) 40 C.F.R. 50.10 1997 Primary and Secondary Eight-HourNAAQS for Ozone 243.125(b) 40 C.F.R. 50.13 2008 Primary and Secondary Eight-HourNAAQS for Ozone

The Board does notengage in substantive review offederal standards inthe context ofan identical-in-substance proceeding, except as necessmyto incorporate them into the Illinois air regulations. Persons wishing to understand the substance ofa federal standm·d should review the 

### FederalRegisternotices bywhich USEPA has adopted, reviewed, and amended the various standards. Those notices are listed in the foregoing review ofthe federal standards for ozone in the initial portion ofthis discussion.
The Board has codified the federal NAAQS for ozone without substantive revision. All ofthe deviations from the literal text ofthe federal NAAQS for Ozone are itemized in Table I. Two revisions that the Board has not made warrant discussion. These relate to the sunset ofthe 1979 one-hour and the pattial sunset ofthe 1997 eight-hour NAAQS for ozone. 

### Sunseto(the 1979Prim

### myandSecondary One-HourNAAOS (or Ozone. The conditions ofthe sunset clause applicable to the 1979 one-hour standard have been fulfilled. Itis

while USEPA formulates mles for transition from the 1997 standard to the 2008 standard. 

### See 73 Fed. Reg. 16436, 503 (Mar. 27, 2008).possible for the Boardto omit the material derived fi·om 40 C.F.R. 50.9 from the adopted version ofthe present amendments.
The 1979 one-hourNAAQS for ozone has not applied to any area ofIllinois after June 5, 2005. The 1979 standard provides that itno longer applies to an area one year after the effective date ofits area designation byUSEPA for the 1997 primary and secondary eight-hour standard for ozone. 

### See 40 C.F.R. 50.9(b) (2012). USEPA designated areas ofIllinois for the 1997 primary and secondary eight-hour NAAQS for ozone effective June 15,2004. 

### See 40 C.F.R. 81.314 (2012) (the table for the 1979 eight-hourNAAQS for ozone); 69 Fed. Reg. 23858 (Apr. 30, 2004) (designation ofall areas ofIllinois). USEPA revoked the 1979 one-hourNAAQS as to all areas ofIllinois effective June 15, 2005. 

### See 40 CFR 81.314 (table for one-hourNAAQS for ozone, note 3; 70 Fed. Reg. 44470, 75 (Aug. 3, 2005) (adding the footnote relating revocation of the 1979 NAAQS for ozone to the table ofarea designations) 25

The Board included the 1979 one-hourNAAQS inthe proposal for public comment, but now removes that standard from the final version ofthese rules. The testimony ofMr. Kolaz at heming maintained that the Board should remove the revoked 1979 one-hourNAAQS for ozone. Tr. at 7-9; Pre-filed testimony ofDavid Kolaz at 3. ByPC I, IERG made this point more clearly. 

### See PC I at 2-3. The Board cannot adopt standards that do not apply to persons or facilities in Illinois. 415 ILCS 5/7.2(a)(l) (2012).


### PartialSunset ofthe 1997PrimmyandSecondmyEight-HourNAAOS (or Ozone. The conditions ofthe sunset clause applicable to the 1997 eight-hour standard will be fulfilled before final adoption ofthe present amendments. This sunset, however, is pattial-forpurposes oftranspmtation confmmity alone. The pmtial sunset occurs one year afterthe area designations for the 2008 eight-hour standard, after June 15,2013. 

### See 40 C.F.R. 50.10(c) (2012); 40 C.F.R. 81.314 (2012) (the table for the 2008 eight-hour NAAQS for ozone); 77 Fed. Reg. 34221 (June II, 2012) (designation ofareas surrounding Chicago); 77 Fed. Reg. 30088 (May 21, 2012) (designation ofthe rest ofIllinois). The Board has included 40 C.F.R. 50.10 in the present amendments due to the pmtial nature ofthe sunset provision.
Section 243.126: Lead. USEPA adoptedthe initial primaryNAAQS for lead in 1978. 

### See 36 Fed. Reg. 46246 (Oct. 5, 1978). USEPA recently adopted a more-stringent primary NAAQS in 2008. The development ofthe ptimaryNAAQS for lead are outlined as follows:
1978 Primarv Calendar puarterlvAverage NAAQS for Lead (Subject to Sunset) Standard: 1.5 Jlg/m maximum mithmetic mean averaged over a calendar qumter not to be exceeded in total suspended material Citation: 40 C.F.R. 50.12(a) (2012) (originally 40 C.F.R. 50.12 (1979))
October 5, 1978 (43 Fed. Reg. 46246): Original adoption.

25 The federal SIP requirements now allow the Stateto applyto USEPA for removal ofthe obligationfor a maintenance planfor the 1979 one-hour standard eight years after such a revocation and anytime afterUSEPAhas designated all areas ofthe State for the 1997 eighthom· standard. 40 C.F.R. 51.905(e) (2012). Eightyears afterthat revocation is June 15, 2013.November. 12, 2008 (73 Fed. Reg. 66964): Renumbered to subsection (a); sunset provision added: the standard does not apply to an area one year afterUSEPA designation ofthe attainment status ofthat area under the 2008 p1imary and secondary three-month average standard, with one exception26• 2008 Primarv Three-Month Average NAAQS for Lead (Current) Standard: 0.15

### ~g/m**3** arithmetic mean averaged over a three-month period Citation: 40 C.F.R. 50.16(a) (2012)
November. 12, 2008 (73 Fed. Reg. 66964): Original adoption.
Both primmyNAAQS for lead remain codified in two federal rules: 40 C.P.R. 50.12 and 50.16. TheBoard has codified the 2008 primmy three-monthNAAQS for lead in 35 Ill. Adm. Code 243.126. The Board has replaced the existingprovision relative to lead with the text ofthe federal NAAQS, adding the 1978 primmy calendar qumierly NAAQS for lead to the text. Each ofthe federal provisions relative to lead appears in a separate subsection, one for each ofthe 1978 and 2008 standards. The two NAAQS for lead are codified as follows:

Subsection Federal Citation NAAQS 243.126(a) 40 C.P.R. 50.12 1978 Primary Calendar Qumierly Average NAAQS for Lead 243.126(b) 40 C.P.R. 50.16 2008 Primary Three-Month Average NAAQS for Lead

The Board repeats that the Board does not engage in substantive review offederal standm·ds in the context ofan identical-in-substance proceeding, except as necessmy to incmporate them into the illinois air regulations. Persons wishing to understand the substance of a federal standard should review the FederalRegisternotices bywhich USEPA has adopted, reviewed, and amended thevarious standards. Those notices are listed in the foregoing review ofthe federal standards for lead in the foregoing outline offederal development ofthe lead NAAQS.
The Board has codified the federal NAAQS for lead without substantive revision. All of the deviations from the literal text ofthe federal NAAQS are itemized in Table 1. The Board discusses here only one significant issue relating to the federal standards: sunset provision inthe 1978 primaryNAAQS for lead. The issue did not result in deviation from the federal text.
Sunset o(tlze 1978Primary Calendar OuarterlvAverageNAAOSfor Lead. The adoption ofthe 2008 NAAQS for lead resulted in addition ofa sunset clause to the 1978 NAAQS for lead. The Board does not see that the conditions ofthe sunset clause have yet been met for all areas ofIllinois, so the Board has included the 1978 NAAQS in this adopted rule.

26 The exception relates to areas deemed not in attainment with the 1978 standard before the effective date ofthe 2008 standard.When adopting the 2008 standard, USEPA added a sunset clause to the 1978 primary calendar quarterly average NAAQS for lead. 

### See 40 C.F.R. 50.!2(b)(2012); 73 Fed. Reg. 66964 (November. 12, 2008). The sunset clauseprovides that the 1978 NAAQS no longer applies to an area that USEPA has designated for the 2008 standard one year afterthe effective date ofthe designation, except for areas that USEPA has designated "non-attaimnent" with the 2008 standard. 

### See 40 C.F.R. 50.12(b) (2012). For non-attaimnent areas, the 1978 standard no longer applies after USEPA has approved a plan for attaimnent ormaintenance ofthe 2008 NAAQS. 

### See/d.
Forthe 2008 NAAQS for lead, USEPAhas designated two areas ofthe state as nonattaimnent and the rest ofthe State as "unclassifiable/attaimnent." The two non-attaimnent areas are segments ofCook and Madison Counties. 

### See 40 C.F.R. 81.314 (2012); 76 Fed. Reg. 72097 (Nov. 22, 2011); 75 Fed. Reg. 71033 (Nov. 22, 2010). Since the Board cannot find a USEPAapproved plan for attainment ormaintenance for those two areas, the 1978 NAAQS for lead remains viable in limited areas ofthe State. The Board has incorporated the 1978 standard for lead into the Illinois mles, adding explanation ofthe status ofthis NAAQS in an appended Board note.
Non-Inclusion ofthe 2012 NAAQS for PMz.s and PM10 The Boardmonitors USEPA actions inthe several identical-in-substance subject areas27
on an ongoing basis for USEPA actions that would require Board mlemaking activity. Ifthe Board observes a USEPA action subsequent to the nominal timefran1e ofan identical-insubstance proceeding that affects the same subject matter, the Board has included that later action within the mles under development. 

### See, e.g., SDW A Update. USEPA Amendments (Janumy 1. 2012 through June 30. 2012. and July 25. 2012), R13-2 (Jan. 24, 2013), slip op. at 3, 6 (no additional amendments); RCRA Subtitle C Update. USEPA Amendments (July I. 2008 through December 31. 2008 and June 15. 2010), R09-l6, RCRA Subtitle C Update. USEPA Regulations (Janumy I. 2009 through June 30. 2009). Rl0-4 (June 17, 2010), slip op. at 5-6, 272 (withdrawing amendments); SDWA Update. USEPA Amendments (Janumy I. 2007 though June 30. 2007 and June 3. 2008), R08-7, SDWA Update. USEPA Amendments (July 

### 1. 2007 though December 31. 2007), R08-13 (Dec. 18, 2008), slip op. at 4, 8 (adding amendments).
OnJanum·y 15, 2013, USEPA detennined to retain the 1987 primary and secondmy 24- hourNAAQS for PM10, revised the data handling conventions applicable to all four ofthe PM2

### .s NAAQS 28

, and adopted two newNAAQS for particulate matter29 There are one new NAAQS

27 Definition ofvolatile organic mate1ial, NAAQS, underground injection control, wastewater pretreatment, RCRA Subtitle C (hazardous waste), underground storage tanks, and RCRA SubtitleD (municipal solid waste landfill) regulations. 

### See 415 ILCS 5/9.l(e), lO(H), 13(c), 13.3, 22.4(a) and (c), and 22.40(a) (2012) (respectively).

28 The 1997 and 2006 Primary and secondary aruma! average and 24-hourNAAQS for PM25•for PM10 and three new NAAQS for PM25

. Those standards are the following (using the fonnat employed above for all ofthe historical and existingNAAQS):
1987 Primarv and Secondarv 24-Hour NAAQS for PM10 Standard: !50 )lglm3not to be exceeded more than once peryear, on a three-year average basis Citation: 40 C.P.R. 50.6(a) (2012) July I, 1987 (52 Fed. Reg. 24634): Original adoption. July 18, 1997 (62 Fed. Reg. 38652): Sunset provision added. 30 December 22, 2000 (65 Fed. Reg. 80776): Sunset provision removed31 January 15,2012 (78 Fed. Reg. 3086): Retained without revision.
1997 Primarv and Secondarv Annual Average NAAQS for PM, 5 Standard: 15.0 )lg/m3arithmetic mean, averaged over three years Citation: 40 C.P.R. 50.7(a) (2012) (originally 40 C.P.R. 50.7(a)(l) (1998)) July 18, 1997 (62 Fed. Reg. 38652): Original adoption. July 30, 2004 (69 Fed. Reg. 45592): Renumbered to subsection (a). Januaty 15,2012 (78 Fed. Reg. 3086): Retained without revision, but subject to revised data handling conventions in appendix N to 40 C.P.R. 50.
1997 Primarv and Secondarv 24-Hour NAAQS for PM,.5 Standard: 65 )lglm 3 98th percentile, averaged overthree years Citation: 40 C.P.R. 50.7(a) (2012) (originally 40 C.P.R. 50.7(a)(l) (1998)) July 18, 1997 (62 Fed. Reg. 38652): Original adoption. July 30, 2004 (69 Fed. Reg. 45592): Renumbered to subsection (a). Janumy 15, 2012 (78 Fed. Reg. 3086): Retained without revision, but subject to revised data handling conventions in appendix N to 40 C.P.R. 50.

29 The USEPANAAQS webpage (www.epa.gov/ttn/naaqs/standards/prnls_pm_histmy.html) lists all ofthe remaining standards as 2012 standards: the ptimary annual NAAQS for PM2.5, added as 40 C.P.R. 50.18(a); the secondary annualNAAQS for PM2
.5, which remains unchanged as 40 C.P.R. 50.13(a) (the 2006 standard); the primmy and secondary 24-hourNAAQS for PM2.s, which was added as 40 C.P.R. 50.18(a) and remains codified as 40 C.P.R. 50.13(a) (the 2006 standard); and the primary and secondary 24-hourNAAQS for PM10, which remains codified as 40 C.P.R. 50.6(a) (the 1987 standard).

30Notdescribed inthis summary outline because USEPA subsequently removed the sunset provision. See 40 C.P.R. 50.6(d) (1998) (the removed sunset provision).

31 As a result ofthe decision in American Trucking Assoc. v. EPA, 175 F. 2d 1027, modifieden bane, 195 F.3d 4 (D.C. Cir. 1999), aff'd inpart and rev 'dinpartsub nom. Whitman v. American Trucking Assoc., 531 U.S. 457, 121 S. Ct. 903, 149 L. Ed. 2d 69 (2001), on remand, 283 F.3d 355 (D.C. Cir. 2002).2006 Primary and Secondarv Annual Average NAAOS for PM, 5 Standard: 15.0 [.lg/m3arithmetic mean, averaged over three years Citation: 40 C.F.R. 50.13(a) (2012)
October 17, 2006 (71 Fed. Reg. 61144): Original adoption. January 15, 2012 (78 Fed. Reg. 3086): Retained without revision, but subject to revised data handling conventions in appendix N to 40 C.F.R. 50.
2006 Primarv and Secondarv 24-Hour NAAQS for PM,_5 Standard: 35 [.lg/m398th percentile, averaged overthree years Citation: 40 C.F.R. 50.13(a) (2012)
October 17, 2006 (71 Fed. Reg. 61144): 01iginal adoption. January 15, 2012 (78 Fed. Reg. 3086): Retained without revision, but subject to revised data handling conventions in appendix N to 40 C.F.R. 50.
2012 Primarv Annual Average NAAQS for PMo,.:; Standard: 12.0 [.lg/m3arithmetic mean, averaged over three years Citation: 40 C.F.R. 50.18(a), as added at 78 Fed. Reg. 3086,277 (Jan. 15, 2013) January 15,2012 (78 Fed. Reg. 3086): Original adoption.
2012 Primarv 24-Hour NAAQS for PM2.5 Standard: 35.0 [.lg/m398th percentile, averaged over three years Citation: 40 C.F.R. 50.18(a), as added at 78 Fed. Reg. 3086, 277 (Jan. 15, 2013) Janumy 15, 2012 (78 Fed. Reg. 3086): Original adoption.
The Board has opted not to include theJanuary 15,2013 federal amendments relating to PM25 with this initial adoption ofidentical-in-substance NAAQS standards. Adding the amendments to the present proceeding would cause minor delay in adoption ofthe present initial amendments. The Board sees no benefit in adding the new 2012 NAAQS to this proceeding. The State and USEPA will begin monitoring for the new standards as a matter offederal law whetherthe Board adopts the Janua1y 13, 2013 federal amendments in this proceeding or in a separate proceeding that could conclude as late as January 14,2014.32 Responses to Requests for Public Comments
The Board requested comments on general aspects ofthe May 16, 2013 proposal for public comment, such as the Board's approach to the statutory mandate, the standardized naming ofthe NAAQS in the text, the choice ofstructure, complete replacing ofthe existing Illinois standards, the incorporations byreference, etc. The Board further requested public comments on specific aspects ofthe proposal. The specific requests for comments are itemized as follows:

32 See 415 ILCS 5/7.2(b) (2012).I. Removal ofmonitoring locations requirement Is it tme that the design, location, and operation ofmonitoring locations and networks occurs as a matter offederal law? Is it tmethat the design, location, and operation ofmonitoring locations and networks are subject to USEPA review and approval? Is there any reason the Illinois NAAQS regulations should include incorporation of40 C.P.R. 58 by reference? Ifthe Board shouldretain the monitoring requirement, is the following language in 35 Ill. Adm. Code 243.106 sufficient?
All monitoring pe1formed to fulfill the requirements ofthis Pm1mustbe perfom1ed at stations a11d networks ofstations designed, located, a11d operated according to plans approved byUSEPA according to the requirements of40 C.P.R. 58.
IERG stated supp011 for removal ofthe monitoring locations requirement, observing that the requirement is not a proper component ofambient air quality standards. Pre-filed testin1ony ofDavid Kolaz at 2.
2. Removal ofnon-degradation requirement Do the federal PSD requirements render the non-degradation mle of35 Ill. Adm. Code 243.104 unnecessa1y? Is there any way that the Board should perceive non-degradation as a segment ofthe federal NAAQS?
IERG stated support for removal ofthe non-degradation requirement, observing that the requirement is not a proper component ofambient air quality standards. Pre-filed testin1ony ofDavid Kolaz at 2.
3. USEPA approvals ofPRMs and PEMs: Will the unavoidable delay in incorporation ofUSEPA methods designations into the illinois regulations create difficulty in implementation ofthe federal NAAQS in Illinois? Is there any available altemative that could minimize the delay?
The Board received no comments in this regard.
4. Expiration ofthe 1979 one-hourNAAQS for ozone: Is it tme that the 1979 standard for ozone will not apply to any area ofIllinois after July 20, 2013? Ifso, maythe Boardremove the 1979 one-hour sta11dard for ozone after that date?
IERG stated support for removal ofthe 1979 one-hourNAAQS for ozone. Mr. David Kolaz observed onbehalfofIERG that this NAAQS was revoked in 2005 as to all areas in Illinois. Tr. at 7-10; Pre-filed testimony ofDavid Kolaz at 2. IERG made this point also inPC I.
5. Expiration ofthe requirement for a maintenance plan for the 1979 one-hour NAAOS for ozone: Is ittme that the State may apply to USEPA to remove the requirement for a maintenance plan for the 1979 one-hourNAAQS for ozoneafter June 15, 2013? Ifso, may the Boardremove the 1979 one-hour standard for ozone after that USEPA approval?
The Boardreceived no comments in this regard.
6. Partial expiration ofthe 1997 PJimary and secondmy eight-hourNAAQS for ozone: Is it hue that that the 1997 eight-hour standard for ozone will no longer apply to any area after June 15, 2013 for transportation confonnitypurposes? For what purposes will that 1997 standard continue to apply? What event or series of events could occurwithin the next few years that could wan·ant removal ofthe 1997 from the Illinois regulations?
The Board received no comments in this regard.
7. Expiration ofthe 1978 primmy calendar qum1erly average NAAQS for lead: Is it true that the 20 II and 2012 area designations for the 2008 NAAQS for lead rendered the 1978 calendar qum1erlyNAAQS for lead inapplicable to all areas of Illinois except for the two limited non-attainment areas? What is the cun·ent status ofthe State obtaining an approved attainment ormaintenance plan for those two areas? When USEPA has approved an attainment or maintenance plan for those areas, should the Boardremove the 1978 NAAQS for lead fi·om the Illinois regulations?
The Boardreceived no comments directly in this regard. Rather, 

### Mr. David Kolaz testified that, as a general matter, the Board should remove revoked and inapplicable federal standards from the Illinois regulations. Tr. at 9; Pre-filed testimony ofDavid Kolaz at 2-3.
8. General re removal ofexpired NAAOS: When the Board observes that the conditions in a sunset clause applicable to a NAAQS may have beenfulfilled, should the Board propose deletion ofthat standard? As a second altemative, should the Board waituntil USEPA has expressly codified that the NAAQS does not applyto any area in Illinois? As a second altemative, should the Board leave thatNAAQS in the Illinois rules until USEPA has removed that standard fi·om 40 C.F.R. 50?
Mr. David Kolaz testified that the Board should remove revoked and inapplicable federal standards from the Illinois regulations. Tr. at 9; Pre-filed testimony of David Kolaz at 2-3.

Deviations from the Literal Text ofthe Federal Amendments

and Non-Federallv Derived Corrections and Clarifications
The Board routinely examines federal amendments and the base text ofrules open for amendments to find any areas that need conectionor clarification. JCAR and the Office ofthe Secretary ofState also routinely examine the text and suggest cmTections and clarifications.Sometimes suggestions arise from the Agency, USEPA, or members ofthe regulated community. The Board often makes revisions as a result. The revisions thus made are not directly de1ived from federal amendments. The Board is evermindful ofthe limited discretion authorized in the context ofan identical-in-substance proceeding. The Board is limited to "those changes that are necessary for compliance with the Illinois Administrative Code," "technical changes that in no way change the scope ormeaning ofany portion ofthe regulations," and "apparenttypographical and grammatical errors." See 415 ILCS 5/7.2(a) and (a)(7) (2012). Thus, the Board will only make minor, non-substantive corrections and clarifications in this context. These CO!Tections are non-substantive in effect. Tables follow that document the corrections and clmifications made in this proceeding. The first lists the deviation from the literal text ofthe USEPA amendments involved in this proceeding. The second lists the CO!Tection made in this docket that was not prompted by federal mnendments.
Tabulations ofDeviations from the Literal Text ofthe Federal Amendments and Miscellaneons Board Housekeeping Amendments.
The tables below list numerous CO!Tections and amendments that are not based on current federal mnendments. Table 1 (beginning immediately below) lists a number offederal amendments that the Boardhas not included in this docket. Table 1 gives a briefexplanation whythe Board has declined to make each. Table 1 (beginning immediatelybelow) includes deviations made in the adopted text from the verbatim text ofthe federal amendments. Table 2 (beginning inunediately afterTable 1 on page 91) contains corrections and clarifications that the Board made in the base text involved in the present amendments. The amendments listed in Table 2 are not directly derived from the cun·ent federal amendments. Some ofthe entries in these tables are discussed further in appropriate segments ofthe general discussion beginning at page 6 ofthis opinion. Table 3 (beginning on page### below) is a listing ofrevisions made to the text ofthe amendments from that proposed and set forth in the Board's opinion and order of May 16,2013. Table 3 indicates the changes made, as well as the source that suggested each of the changes. Table 4 (on page###below) indicates suggested revisions that the Boardhas not made in adopting these amendments. Each entry gives abriefexplanation why the Board did not incorporate the suggested change.
Table 1: Deviations from the Text ofthe Federal Rules

Illinois Section 40 C.P.R. Section Revision(s)
243 table ofcontents, 50.14 heading Removed "Treatment of' from before 243.105 heading "airquality monitoring data"; capitalized the first letter ofeach word in the heading.243 table ofcontents, Table 1to 50.14(c)(2)(vi) Removed "Data to be Used for 243.I05 heading heading Designations Decisions" from before "forNew or Revised NAAQS"; changed the format from large and small capital letters to standard format with capitalization ofthe first letter ofeach word in the heading.
243.101 generally 40 C.F.R. 50.1 Replaced the existing language with new language more directly derived from the corresponding federal provision.
243.101 preamble 40 C.F.R. 50.1(a) Added the affirmative sentence, "Forthe purposed ofthis Part, terms listed below

... this Section."; changed "herein" to "inthis Section"; changed "shall" to "will"; changed "Act" to "the Act; the CAA, incorporated byreference in Section 243.108; or 35 Ill. Adm. Code 201.102" (which are Illinois law that should be consistent with the CAA).
243.101 "Act" 40 C.F.R. 50.l(b) Placed the defined term in quotation marks; changed the definition fi"om meaning the federal CAA, as amended, to mean the Enviromnental Protection Act.
243.101 "Agency" 40 C.F.R. 50.l(c) Placed the defined term inquotation marks; changed the defmition from meaning USEPA, as amended, to mean the lllinois EPA.
243.101 "Clean Air 40 C.F.R. 50.l(b) Created the separate defined term to Act" meanthe federal statute; placed the defined te1m in quotation marks; added the altemative defined abbreviated te1m "CAA" in quotation marks; added "federal" for clarity; changed "42 U.S.C. 1857-18571, as amended byPub. L. 91- 604" to "42 U.S.C. 7401 et seq., as amended."243.101 "exceedance 40 C.F.R. 50.1(1) Placed the defined te1m in quotation ofanNAAQS" marks; moved the defmition into alphabetic order; changed the long defined te1m "exceedance withrespect to a national ambient air quality standard" to the shorter form "exceedance ofa NAAQS"; changed "such standard" to "suchNAAQS."
243.101 "exceptional 40 C.F.R. 50.l(j) Placed the defined tenn in quotation event" marks; moved the definition into alphabetic order; added "fulfills all of the following criteria" and a colon after "that"; divided so to place each criterion into a separate subsidiary paragraph; added "the event" (fourtimes); changed the commas to semicolons to separate each criterion; changed "the event is an event caused" to "the event is caused"; changed "Administrator" to "USEPA"; changed "it does not" to "an 'exceptional event' does not"; added "any ofthe following," followed by a colon, and subdivided the conditions into subsidimyparagraphs; changed the separating commas to semicolons.243.101 "federal 40 C.P.R. 50.l(g), Placed the defined tern1 in quotation equivalent method" 50.11(d)(2), and 53.1 marks; moved the definition into alphabetic order; added "federal" to the defined tenn and the abbreviated alternative definition "PEM"based on the defmition that appears at closely related 40 C.P.R. 53.1; changed "that has been designated" to active-voice "thatUSEPA has designated"; changed "in accordance withpatt 53 ofthis chapter" to "pursuant to 40 CPR 53 and which is listed included in the List of Designated Methods, including later updates, as incorporated byreference

... 243.108"; changed "it does not include" to "the tenn 'federal equivalent method' does not include"; changed "forwhich
an equivalent method designation has been cancelled" to active-voice "for which USEPA has cancelled or superseded an equivalent method designation"; changed"§ 53.11 or § 53.16 ofthis chapter" to "40 CPR 53.11 or 53.16"; added the parenthetical "as reflected by

... Section 243.108."
243.101 "federal 40 C.P.R. 50.1 (g), Added explanation ofthe derivation of equivalent method" 50.11 (d)(2), and 53.1 the defmition from multiple sources; Board note added explanation of"including later updates"; added explanation ofthe effectiveness ofdesignation ofan PEM and cancellation ofan PEM.243.101 "federal 40 C.P.R. 50.l(f) and Placed the defmed te1m inquotation reference method" 53.1 marks; moved the defmition into alphabetic order; added "federal" to the defined te1m and the abbreviated alternative definition "PRM" based on the definition that appears at closely related 40 C.P.R. 53.1; changed "that has been designated" to active-voice "thatUSEPAhas designated" (twice); changed "in an appendix to this part" to "in an appendix to 40 CPR 50, incorporated

... 243.108"; changed "in accordance with pmt 53 ofthis chapter" to "pursuantto 40 CPR 53 and which is listed included in the List ofDesignated Methods, including later updates, as incorporated byreference

... 243.108"; changed "it does not include" to "the term 'federalreference method' does not include"; changed "forwhich an reference method designation has been cancelled" to active-voice "forwhich USEPA has cancelled or superseded a reference method designation"; changed "§ 53.11 or§ 53.16 ofthis chapter" to "40 CPR 53.11 or 53.16"; added the parenthetical "asreflected in

... Section 243.108."
243.101 "federal 40 C.P.R. 50.l(f) and Added explanation ofthe derivation of reference method" 53.1 the definition from multiple sources; Board note added explanation of"includinglater updates"; added explanation ofthe effectiveness ofdesignation ofan PRM and cancellation ofan PRM.
243.101 "micrograms 40 C.P.R. 50.6(a); Added the defmition ofthe te1m and the per cubic meter" 50.7(a), and 50.13(a) and abbreviated form to support consistent 58.1 (definitions of use ofthe abbreviated form throughout PM2.s, PM10, PM10c, and the text. PM10.2.sl243.101 "micrograms 40 C.F.R. 50.6(a); Added explanation that the Board added percubic meter" 50.7(a), 50.8(a)(l) and the defmitions of"micrograms per cubic Board note (a)(2), and 50.13(a) and meter" and "milligramsper cubic 58.1 (definitions of meter." PM2.s, PM10, PM10c, and PM10-2s)
243.101 "milligrams 40 C.F.R. 50.8(a)(l) and Added the definition ofthe te1m and the percubic meter" (a)(2) abbreviated fonn to support consistent use ofthe abbreviated form throughout the text.
243.101 "National 40 C.F.R. 50 generally, Bon·owed the definition ofthe te1m and AmbientAir Quality and "Terms of the abbreviated fonn to support Standards" Environment: Glossmy, consistent use ofthe abbreviated form Abbreviations, and tln·oughout the text; changed plural Acronyms" (Dec. 1997) "National AmbientAir Quality Standards" to singular; changed plural "standards" to singular "a standard"; changed "EPA" to "USEPA"; changed "the country" to "the United States."
243.101 "National 40 C.F.R. 50 generally, Added explanation ofthe added Ambient Air Quality and "Terms of definition and its source. Standards" Board note Environment: G1ossmy, Abbreviations, and Acronyms" (Dec. 1997)
243.101 "natural 40 C.F.R. 50.1(±) and Placed the defined term in quotation event" 53.1 marks; moved the definition into alphabetic order.
243.101 "parts per 40 C.F.R. 50 generally, Derived the defmition and the billion" and "Te1ms of abbreviated fmm to support consistent Environment: Glossary, use ofthe abbreviated form throughout Abbreviations, and the text. Acronyms" (Dec. 1997)
243.101 "parts per 40 C.F.R. 50 generally, Added explanation ofthe added billion" Board note and "Te1ms of definition and the definition of"parts per Environment: Glossmy, million" and their source. Abbreviations, and Acronyms" (Dec. 1997)243.101 "pmts per 40 C.F.R. 50 generally, Derived the definition and the million" and 'Te1ms of abbreviated fmm to support consistent Environment: Glossary, use ofthe abbreviated fmm throughout Abbreviations, and the text. Acronyms" (Dec. 1997)
243.101 "PM,o" 40 C.F.R. 50.6(c) Derived the defmition ofthe abbreviated parenthetical fmm to suppmt consistent use ofthe abbreviated fonn throughout the text; placed the defined te1m in quotation marks; changed "pmticles having" to "pmticulatematterthat has"; added the abbreviation ")lm" in parentheses.
243.10I "PM25"Board 40 C.F.R. 50.6(c) Added explanation ofthe added note parenthetical definition and the definition.
243.101 "PM2.s" 40 C.F.R. 50.7(a) Derived the definition ofthe abbreviated parenthetical fonn to support consistent use ofthe abbreviated form tlu·oughout the text; placed the defined tem1 in quotation marks; changed "pa1ticles having" to "pmticulatematter that has"; added the abbreviation ")lm" in parentheses.
243.101 "PM10"Board 40 C.F.R. 50.7(a) Added explanation ofthe added note parenthetical definition and the definition.
243.101 "traceable" 40 C.F.R. 50.l(h) Placed the defined term inquotation marks; moved the defmition into alphabetic order; added the comma before "such as a National Bureau of Standards

... reference Mmmal (CRM)" to offset the parenthetical.
243.101 "USEPA" 40 C.F.R. 50.I( c) Added the definition based onthe federal definition of"Agency"; changed the defmed tem1 to "USEPA"; added "United States" before "Environmental Protection Agency."
243.101 "USEPA" 40 C.F.R. 50.!(c) Added explanation ofthe derivation and Board note use ofthe defined term in the text.
243.101 Board note 40 C.F.R. 50.1 generally Added explanation ofthe derivation of this Section.243.102 heading 50.2 heading Changed the heading from "Preamble" to "Scope" to conespond with the federal regulations.
243.102 generally 50.2 generally Replaced the existing language ofthis Section with that ofthe conesponding federal regulation. 243.102(a) 50.2(a) Changed "as set fm1h in this pm1" to "This Pm1 sets fm1h" and moved it to the beginning ofthe provision; changed "nationalprimary and secondary ambient air quality standards" to use the defined abbreviation "the NAAQS"; added "adoptedbyUSEPA"; changed "section 109 ofthe Act" to "section I09 ofthe CAA (42 USC 7409)"; added "and incorporated into this Partpursuant to 415 ILCS 5/7.2 and 10(H)." 243.102(b) 50.2(b) Added the parenthetical "(primary NAAQS)"; changed "whichthe Administratorjudges" to "thatUSEPA hasjudged" (twice); added the parenthetical "(secondaryNAAQS)"; changed "such standards" to "these standards"; changed "primary and secondary standards" to "primm·y and secondaryNAAQS"; changed "the Administrator" to "USEPA" 243.102(c) 50.2(c) Changed "primary and secondary ambient air quality standards" to "primary and secondaryNAAQS"; changed "any State or Indian country" to "this State."
243.102 Board note 40 C.P.R. 50.2 generally Added explanation ofthe derivation of this Section.
243.103 None Retained the applicability statement, despite the lack ofa federal counterpm1.243.105 generally 50.14 generally Added the provision relative to monitoring data and exceptional events that had not counterpatt in the Illinois regulations.
243.105 heading 50.14 heading Removed "Treatment of'' from before "airquality monitoring data"; capitalized the first letter ofeach word in the heading. 243.105(a)(l) 50.14(a)(l) Changed "a State" to "the Agency"; change "EPA" to "USEPA"; moved "fromuse in the detenninations" from before "bydemonstrating" to follow "exclude"; changed plural "exceedances or violations

... that are" to "an exceedance

... that is"; changed "national ambient air quality standard" to the defined abbreviation "NAAQS"; divided the run-on sentence after "exceptional event" by addition ofa period and "the Agency must"; changed "bydemonstrating to USEPA's satisfaction" to active-voice "demonstrateto USEPA"; changed "such event" to "the event." 243.105(a)(2) 50.14(a)(2) Added the indefinite atticle before "demonstration"; changed "exceedance
or violation" to "exceedance"; changed "such standard" to "anNAAQS." 243.105(b) 50.14(b) Changed "EPA" to "USEPA"; added "USEP A has stated

... as follow" and an ending colon.243.105(b)(l) 50.14(b)(l) Added the topical heading "Exceptional events."; changed "EPA" to "USEPA"; added "has stated that it will"; changed "exceedances orNAAQS violations" to the singular defined term "exceedance of an NAAQS"; changed "a State demonstrates to EPA's satisfaction" to "theAgency has demonstrated"; changed "one ormore national ambient air quality standards" to "one ormore NAAQS"; created an independent clause byplacing a comma before and changing "and otherwise satisfies" to "and the Agency otherwise satisfies"; changed "this section" to "40 CFR 50.14." 243.105(b)(2) 50.14(b)(2) Added the topical heading "Fireworks displays."; changed "EPA" to "USEPA"; added "has stated that it will"; changed "exceedances orNAAQS violations" to the singular defined te1m "exceedance ofan NAAQS"; changed "a State demonstrates to EPA's satisfaction" to "the Agency has demonstrated"; changed "one or more national ambient air quality standards" to "one or more NAAQS"; changed "and otherwise satisfies" to "and the State othetwise satisfies" preceded by a comma for an independent clause; changed "such data" to "USEPA has stated that these data"; changed "a State demonstrates" to "the Agency has demonstrated"; changed "suchuse of fireworks" to "theuse offireworks"; added a commabefore and after "including

... celebrations" to offset the parenthetical and add clarity; changed "this section" to "40 CFR 50.14."243.105(b)(3) 50.14(b)(3) Added the topical heading "Prescribed fires."; changed "EPA" to "USEPA" (three times); added "has stated that it will"; changed "exceedances orNAAQS violations" to the singular defined term "exceedance ofan NAAQS"; changed "a State demonstrates to EPA's satisfaction" to "the Agencyhas demonstrated"; changed "one or more national ambient air quality standards" to "one or more NAAQS"; created an independent clause byplacing a comma before and changing "and otherwise satisfies" to "andthe Agency othe1wise satisfies"; changed "this section" to "40 CFR 50.14"; changed "defmition in § 50.1 (j)" to "defmition of"exceptional event in Section243.101"; changed "State" to "Agency"; changed "if' to "the State"; added the parenthetical abbreviation "(SMP)"; changed "State" to lower-case "state"; changed "the State" to "theAgency"; changed "its" to "the State's"; changed "a SMP" to "an SMP." 243.105(b) Board note 50.14(b) Added explanation ofthe shift fi·om "EPA shall" to "USEPA has stated that 

### ' it will" in all occunences in this subsection; added explanation of reliance on the defined term "exceedance ofanNAAQS" in place of the federal language. 243.105(c)(l) 50.14(c)(l) Moved the text of40 CFR 50.14 (c)(l)(i) into subsection (c)(1),since there is no paragraph (c)(l)(ii); changed "All States and, where applicable, their political subdivisions" to "theAgency or, where the Agency has delegated authoritypursuant to Section 4(g) or (r) ofthe Act [415 ILCS 5/4(g) or (r), the Agency's delegatee"; changed "exceedances ofan applicable air quality standard" to the defined te1m to "exceedances ofan NAAQS."243.105(c)(2)(A) 50.14(c)(2)(i) Changed "a State shall" to "the Agency must"; changed "EPA" to "USEPA"; changed "exceedance ofan applicable air quality standard" to the defined te1m "exceedance ofanNAAQS"; changed "AQS" to "federal air quality system (AQS)."
243.105(c)(2)(B) 50.14(c)(2)(ii) Changed "shall" to "must" (twice); changed "exceedance ofan applicable air quality standard" to the defined te1m "exceedance ofanNAAQS"; changed "EPAnotifies the State" to "USEPA notifies the Agency" and moved it from before "byplacing as concunence flag" to follow "until"; changed "ofits concunence following the State's" to "ofUSEPA concunence following the Agency's"; changed ''its demonstration" to "a den1onstration."
243.105(c)(2)(C) 50.14(c)(2)(iii) Added commas before and after the parenthetical "together with

... the event"; changed "shall" to "must"; changed "EPA" to "USEPA"; changed "July 1st" to "July 1."
243.105(c)(2)(D) 50.14(c)(2)(iv) Replaced the federal language with explanation ofomission ofthat language.
243.105(c)(2)(E) 50.14(c)(2)(v) Replaced the federal language with explanation ofomission ofthat language.243.105(c)(2)(F) 50.14(c)(2)(vi) Changed "when EPA" to "USEPA has stated that when USEPA"; changed "its" to "USEPA"; added the commabefore "and providing" to offset the final element ofa series; changed "Table 1 provides the schedule" to "Table A provides the existing schedule"; changed "shall apply" to "apply"; changed "which" to "that" for a restrictive relative clause; changed "EPA anticipates revising Table 1" to "USEPA has stated that itwill revise the table upon which Table A is based."
243.105(c)(3)(A) 50.14(c)(3)(i) Changed "a State that has flagged

... and is requesting exclusion of

... data" to "whenthe Agency has flagged

... and is requesting exclusion of

... data shall, the Agency must"; changed "to EPA"to "to USEPA" and moved it from after "data exclusion" to follow "a demonstration"; changed "the lesserof, 3 years following

... was recorded or, 12 months" to "the sooner ofthree years following

... or 12 months"; changed "a State" to "theAgency"; changed EPA" to "USEPA"; moved "to USEPA" from after "demonstration" to follow "must submit"; added a comma before "along withits demonstration" for a parenthetical clause.
243.105(c)(3)(B) 50.14(c)(3)(ii) Replaced the federal language with explanation ofomission ofthat language.
243.105(c)(3)(C) 50.14(c)(3)(iii) Replaced the federal language with explanation ofomission ofthat language.
243.105(c)(3)(D) 50.14(c)(3)(iv) Changed "shall" to "must"; changed evidence that" to "the following evidence."
243.105(c)(3)(D)(i) 50.14(c)(3)(iv)(A) Added "that"; changed "criteria" to "definition of"exceptional event."243.105(c)(3)(D)(ii) 50.14(c)(3)(iv)(B) Added "that."
243.105(c)(3)(D)(iii) 50.14(c)(3)(iv)(C) Added "that."
243.105(c)(3)(D)(iv) 50.14(c)(3)(iv)(D) Added "that."
243.105(c)(3)(E) 50.14(c)(3)(v) Changed "State" to "Agency."
243.105 Board note 40 C.F.R. 50.14 generally Added explanation ofthe derivation of this Section.
243.107 50.3 Added commas before and after "for purposes of

... lead" to offset it as a parenthetical; added commas before and after "forpurposes of

... Section 243.126(b)" to offset it as a parenthetical; changed "shall" to "must". See the entry for this provision in Table 2 below.
243.107 Board note 50.3 generally Added explanation ofthe de1ivation of this Section.
243.108 50.4(c); 50.5(b); 50.6(a), Added this provision for inclusion of (c)(1), and (c)(2); required methods and interpretations by 50.7(b)(l) and (b)(2); incmporationbyreference to the 50.8(b)(l) and (b)(2); appendices to 40 C.F.R. 50 and the List 50.9(a); 50.IO(a) and (b); ofDesignated Methods. 50.1l(d)(l), (d)(2), (e), and (f); 50.12(a); 50.13(a)(l), (a)(2), (b), and (c); 50.15(a) and (b); 50.16(a)(l), (a)(2), and (b); 50.17(b) and (c); and Appendices A-1, A-2, B, C, D, F, G, H, I, J, K, L, M, N, 0, P, Q,R, S, S, and T to 40 C.F.R. 50 generally
243.120 50.6, 50.7, and 50.13 Replaced the existing language ofthis generally Section with that ofthe coJTesponding federal regulations.243.120(a) 50.6 heading Changed "national prima1y and secondary ambient air quality standards for PM 10" to "1987 primary and secondary 24-hourNAAQS for PM 10." 243.120(a)(l) 50.6(a) Changed "national primary and secondary 24-hour ambient air quality standards for pm1iculate matter" to "1987 prima1y and secondary 24-hour NAAQS for PM 10"; changed "microgramspercubic meter ([Lg/m3)" to the defined te1m "[Lg/m3"; changed "standards are" to "1987 primary and secondary 24-houorNAAQS for PM 10 is"; changed "this pm1" to "40 CFR 50, incorporated byreference

... Section 243.108." 243.120(a)(2) 50.6(b) Replaced the federal designation "reserved" with a statement that maintains structural parity with the coJTesponding federal rule. 243.120(a)(3) 50.6(c) Changed "primary and secondary standards" to "1987 primary and seconda1y 24-hourNAAQS for PM 10"; changed Hshall" to Hmust"; removed the parenthetical "(particles with an aerodynamic dimneter less than orequal to a nominallO micrometers)," which has become the basis for a definition of "PM 10" in Section 243.101 (see the entry above in this Table 1 ); added "by a method that fulfills either ofthe following requirements."243.120(a)(3)(A) 50.6(c)(l) Changed "areference method" to the defined abbreviation "an FRM''; changed "thispart" to "40 CFR 50, incorporated byreference

... Section 243.108"; added "byUSEPA and listed in" 

### after "and designated"; changed "in accordance with part 53 ofthis chapter" to "inthe List ofDesignated Methods, incorporated byreference in Section 243.108"; changed the ending commato a semicolon. 243.120(a)(3)(B) 50.6(c)(2) Changed "an equivalent method" to the defined abbreviation "an FEM"; added "byUSEPA and listed in" after "and designated"; changed "in accordance withpatt 53 ofthis chapter" to "inthe List ofDesignated Methods, incorporated byreference in Section 243.108." 243.120(a) Board note 50.6 generally Added explanation ofthe derivation of subsection (a); added explanation of USEPA removal ofa transitional provision relative to the 1987 and 1997 NAAQS for PM as a result oflitigation. 243.120(b) 50.7 heading Changed "national primary and secondary ambient air quality standards for PM2

.5" to "1997 primary and secondary annual average and 24-hour NAAQS for PM2. 5."243.120(b)(l) 50.7(a) Changed "thenational primary and secondary 24-hour ambient air quality standards for pmticulate matter are
... annual arithmetic mean concentration, and

... 24-hour average concentration" to "1997 p1imary and secondary annual average NAAQS for PM 10 is

... , annual arithmetic mean concentration, and

... , 24-hour average concentration,"; changed "micrograms percubic meter (J.tg/m3)" to the defined term "J.tg/m3"; removed the parenthetical "(particles with an aerodynamic diameter less than or equal to a nominal2.5 micrometers)," whichhas becomethebasis for a definition of"PM2.s" in Section 243.101 (see the entry above inthis Table 1); changed "either"to "bya method that fulfills the either offollowing requirements.'' 243.120(b)(1)(A) 50.7(a)(l) Changed "a reference method" to the defined abbreviation "an FRM"; changed "this pmt" to "40 CFR50, incorporated byreference

... Section 243.108"; added "byUSEPA and listed in" after "and designated"; changed "in accordance withpmt 53 ofthis chapter" to "intheList ofDesignatedMethods, incorporated byreference in Section 243.108." 243.120(b)(1)(B) 50.7(a)(2) Changed "an equivalent method" to the defined abbreviation "an FEM"; added "byUSEPA and listed in" after "and designated"; changed "in accordance withpa1t 53 ofthis chapter" to "inthe List ofDesignated Methods, incorporated byreference in Section 243.108."243.120(b)(2) 50.7(b) Changed "annual primary and secondary 

### PM2.5 standards are" to singular "1997 primary and secondary annual average NAAQS for 

### PM2
.5 is"; changed "this part" to "40 CFR 50, incorporated by reference

... Section 243.108"; changed "microgramspercubic meter" to the defined te1m "11g/m3 ." 243.120(b)(3) 50.7(c) Changed "24-hourprimary and secondary

### PM2.5 standards are" to singular "1997 primary and secondary 24-hourNAAQS for 

### PM2.s is"; changed "this pm1" to "40 CFR 50, incorporated byreference

... Section 243.108"; changed "micrograms per cubic meter" to the defined te1m "11g/mh 243.120(b) Board note 50.7 generally Added explanation ofthe derivation of subsection (b); added explanations ofthe differences betweenthe 1997 and 2006 NAAQS for 

### PM2
.5 and Board retention ofthe 1997 NAAQS for 

### PM2.s243.120(c) 50.13 heading Changed "national primary and secondm-y ambient air quality standards for 

### PM2.s" to singular "2006 primm·y and secondary annual average and 24-hour NAAQS for 

### PM2.s-"243.120(c)(1) 50.13(a) Changed "national primary and secondary ambient air quality standards for particulate matter are
... annual arithmetic mean concentration, and

... 24-hour average concentration" to "2006 primary and secondary annual average NAAQS for pat1iculate matter is

... , annual arithmetic mean concentration, and the 2006 p1imary and secondary 24- hourNAAQS for PM 10 is

... , 24-hour average concentration,"; changed "micrograms percubic meter (J.tg/m3)" to the defined term "J.tg/m3"; removed the parenthetical "(particles with an aerodynamic diameter less than orequal to a nominal2.5 micrometers)," which has becomethe basis for a definition of "PM25" in Section 243.101 (see the entry above in this Table 1 ); changed "either" to "by a method that fulfills the either offollowing requirements." 243.120(c)(!)(A) 50.13(a)(1) Changed "areference method" to the defined abbreviation "an FRM"; changed "thispat1" to "40 CFR 50, incorporated byreference

... Section 243.108"; added "byUSEPA and listed 

### in" after "and designated'"; 

### changed "in accordance withpat153 ofthis chapter" to "inthe List ofDesignated Methods, incorporated byreference in Section 243.108." 243.120(c)(!)(B) 50.13(a)(2) Changed "an equivalent method" to the defined abbreviation "an FEM"; added "byUSEPA and listed in" after "and designated"; changed "in accordance with pat153 ofthis chapter" to "inthe List ofDesignated Methods, incorporated byreference in Section 243.108."243.120(c)(2) 50.13(b) Changed "annual primmy and secondary PM2
.5 standards are" to singular "2006 primmy and secondary annual average NAAQS for PM25 is"; changed "this pmi" to "40 CFR 50, incorporated by reference

... Section 243.108." 243.120(c)(3) 50.13(c) Changed "24-hourprimary and secondary PM2

.5 standards are" to singular "2006 primaty and secondary 24-hourNAAQS for PM2

_ 5 is"; changed "this pmi" to "40 CFR50, incorporated byreference

... Section 243.108." 243.120(c) Board note 50.13 generally Added explanation ofthe derivation of subsection (c).
243.122 50.4, 50.5, and 50.17 Replaced the existing language ofthis generally Section with that ofthe cotTesponding federal regulations. 243.122(a) 50.4 heading Changed "national primary ambient air quality standards" to "1971 prin1ary annual average and 24-hourNAAQS"; added "as"before and "(S02)" as a defined abbreviation after "sulfur dioxide." 243.122(a)(l) 50.4(a) Changed "standard" to "1971 primary annual average NAAQS for sulfur oxides"; changed "parts per million (ppm)" to the defmed tenn "ppm"; changed "shall" to "must" (twice). 243.122(a)(2) 50.4(b) Changed "standard" to "1971 ptimary 24-hourNAAQS for sulfur oxides"; ch311ged "pmis permillion (ppm)" to the defined tenn "ppm"; changed "shall" to "must" (three times).243.122(a)(3) 50.4(c) 

### Changed "shall" to "tnust"; 

### changed "sulfurdioxide" to the defined abbreviation "S02"; changed "reference method" to the defined abbreviation "FRM"; changed "appendix A" to "appendix A-2"; changed "thispart" to "40 CFR 50, incorporated byreference

... Section 243.108"; changed "an equivalent method" to the defined abbreviation "anFEM"; added "by USEPA and listed in" after "and designated"; changed "in accordance with part 53 ofthis chapter" to "inthe List ofDesignated Methods, incorporated byreference in Section 243.108." 243.122(a)(4) 50.4(d) Changed "shall"to "must" (four times); changed "18, 19, 20, 21, 22, or 23 hourly averages" to "18-, 19-,20-,21-, 22-, or 23-hour averages"; changed "using 18, 19, etc." to "usingthe number ofhours (i.e., 18, 19, etc.)"; removed "then" fi·om before "this must be considered." 243.122(a)(5) 50.4(e) Changed "standards

... remain" to "1971 primary annual average and 24- hourNAAQS for sulfur oxides

... remain"; changed "S02 national ambient air quality standards (NAAQS)" to "the 2010 primary one-hourNAAQS for sulfur oxides"; changed "the

# so2 NAAQS

... will no longer apply

..."to "theBoard will delete the 1971 p1imary annual average and 24-hourNAAQS for sulfur oxides

... after fulfillment ofthe conditions recited byUSEPA in corresponding 40 CFR50.4(e)" and deleted all following material.243.122(a)(5) Board 50.4(e) generally Added explanation ofthe continuing note applicability ofthe 1971 primary annual average and 24-hourNAAQS for sulfur oxides, including suppmting citations to USEPA regulations and publicly available documents and an explanation that the Board will remove the 1971 primary annual average and 24-hour NAAQS when the conditions of40 CFR 50.4(e) have clearly been fulfilled. 243.122(a) Board note 50.4 generally Added explanation ofthe derivation of subsection (a). 243.122(b) 50.5 heading Changed "national secondary ambient air quality standard" to "1971 secondmy three-hourNAAQS"; added "as" before and "(S02)" after "sulfur dioxide." 243.122(b)(l) 50.5(a) Changed "3-hour standard" to "1971 secondary three-hourNAAQS for sulfur oxides"; changed "parts per million (ppm)" to the defined tetm "ppm"; changed "3-hour" to written "threehour" (twice); changed "shall" to "must" (three times); changed "nonoverlapping" to hyphenated "non-overlapping"; changed Hl" to written "one." 243.122(b)(2) 50.5(b) Changed "shall" to "must"; changed "sulfurdioxide" to the defined abbreviation "S02"; changed "reference method" to the defmed abbreviation "FRM"; changed "appendix A" to "appendix A-2"; changed "thispart" to "40 CFR50, incorporated byreference

... Section 243.108"; changed "an equivalent method" to the defined abbreviation "anFEM"; added "by USEPA and listed in" after "and designated"; changed "in accordance with paJt 53 ofthis chapter" to "inthe List ofDesignated Methods, incorporated byreference in Section 243.108."243.122(b)(3) 50.5(c) Changed "3-hour" to wtitten "tln·eehour" (six times); changed "shall" to "must" (tln·ee times); removed "then" from before "this must be considered"; changed "3" to written "three." 243.122(b) Board note 50.5 generally Added explanation ofthe derivation of subsection (b). 243.122(c) 50.17 heading Changed "national primary and secondary ambient air quality standards for sulfur oxides (sulfur dioxide)" to "1987 primmy and secondaryNAAQS for PM 10
.

### , 243.122(c)(l) 50.17(a) Changed "national primmy !-hour annual ambient air quality standard for oxides ofsulfur" to "20I0 primary onehourNAAQS for sulfur oxides"; changed "patts perbillion (ppm, which is I pmt in I,000,000,000)" to the defined tetm "ppb"; changed "sulfur dioxide (S02)" to the defined abbreviation "S02." 243.122(c)(2) 50.17(b) Changed "!-hourprimary ambient standard" to "20I0 one-hourprimary NAAQS for sulfur oxides"; changed "Ihour" to written**~'one-hour";** changed "this pmt" to "40 CFR 50, incorporated byreference

... Section 243.108." 243.122(c)(3) 50.17(c) Changed "standard" to "2010 one-hour primaryNAAQS for sulfur oxides"; changed "appendix A or A-1" to "appendix A-I or A-2"; changed "this pmt" to "40 CFR 50, incorporated by reference

... Section 243.108"; changed "aFederal Equivalent Method (FEM)" to the defined abbreviation "anFEM"; added "byUSEPA and listed in" after "and designated"; changed "in accordance with part 53 ofthis chapter" to "inthe List ofDesignated Methods, incorporated byreference in Section 243.108."243.122(c) Board note 50.17 generally Added explanation ofthe derivation of subsection (a); added explanation ofthe continued effect ofthe 1971 primary NAAQS for sulfur oxides in subsection (a).
243.123 heading 50.8 heading Retained the pre-existing heading**~'carbon** 

### monoxide."
243.123 50.8 generally Replaced the existing language ofthis Section with that ofthe conesponding federal regulation. 243.123(a) 50.8(a) Changed "national primary ambient air quality standards" to "1971 eight-hour and one-hourprimaryNAAQS"; added 

### "as follow." 243.123(a)(l) 50.8(a)(l) Changed "an 8-hour average concentration" to w1itten "an eight-hour average concentration of' and moved to the begirming ofsubsection (a)(!); changed "parts permillion" to the defined abbreviation "ppm"; changed "milligrams per cubic meter" to the defined abbreviation "mg/m3"; added a commabefore "notto be exceeded" to offset the parenthetical. 243.123(a)(2) 50.8(a)(2) Changed "a !-hour average concentration" to written "an eight-hour average concentration of' and moved to the beginning ofsubsection (a)(2); changed "par1s permillion" to the defined abbreviation "ppm"; changed "milligramspercubic meter" to the defined abbreviation "mg/m3"; added a comma before "not to be exceeded" to offsetthe parenthetical. 243.123(b) 50.8(b) Changed "shall" to "must"; added "a method that fulfills either ofthe following requirements."243.123(b)(l) 50.8(b)(1) Changed "a reference method" to the defined abbreviation "an FRM"; added "of40 CFR 50, incorporated by reference

... Section 243.108"; added "byUSEPA and listed in" after "and designated"; changed "in accordance with part 53 ofthis chapter" to "inthe List ofDesignated Methods, incorporated byreference in Section 243 .I08"; changed the ending comma to a semicolon. 243.123(b)(2) 50.8(b)(2) Changed "an equivalent method" to the defined abbreviation "an FEM"; added "byUSEPA and listed in" after "and designated"; changed "in accordance with patt 53 ofthis chapter" to "inthe List ofDesignated Methods, incorporated byreference in Section 243.108." 243.123(c) 50.8(c) Changed "8-hour" to w1itten "eighthour" (three times); changed "average" to "average concentration"; changed "shall"to "must" (twice); changed "six (or seven) hourly averages" to "six-hour (or seven-hour) averages"; changed "75 percent ofthe hourly average
... are available" to "75 percent ofthe hourly average
... is available." 243.123(d) 50.8(d) Corrected the spelling "compatision" to "comparison"; changed "shall" to "must" (twice); changed "pa1ts per million" to the defined term "ppm."
243.123 Board note 50.8 generally Added explanation ofthe de1ivation of Section 243.123.
243.124 50.11 generally Replaced the existing language ofthis Section with that ofthe cmresponding federal regulations.
243.124 heading 50.11 heading Changed "national primary ambient air quality standards" to singular "nitrogen oxides (nitrogen dioxide as indicator)."243.124(a) 50.ll(a) Changed "national primary ambient air quality standard for oxides ofnitrogen" to "1971 primary annual average NAAQS for nitrogen oxides"; changed "pm1s perbillion" to the defmed abbreviation "ppb"; added "(N02)" as a defined abbreviation after "nitrogen dioxide." 243.124(b) 50.ll(b) Changed "national primary !-hour ambient air quality standard for oxides ofnitrogen" to singular, written, and with defined abbreviations "2010 primary one-hourNAAQS for nitrogen oxides"; changed "nitrogen dioxide" to the defmed abbreviation "N02." 243.124(c) 50.ll(c) Changed "national primary ambient air quality standard for nitrogen dioxide" to singular "1971 secondary annual averaae NAAQS for nitroaen oxides"· 

## "' "' , changed "pat1s perbillion" to the defined abbreviation "ppb"; changed "micrograms per cubic meter" to "J.Lglm3"; added "measured inthe air as N02" as a parenthetical offsetby a comma. 243.124(d) 50.ll(d) Changed "shall" to "must"; added "in subsections (a) through (c) ofthis Section" for enhanced clarity. 243.124(d)(l) 50.11 (d)(l) Changed "areference method" to the defined abbreviation "an FRM"; changed "thispat1" to "40 CFR 50, incorporated byreference

... Section 243.108"; added "and designated by USEPA and listed in the List of Designated Methods, incorporated by reference in Section 243.108."243.124(d)(2) 50.ll(d)(2) Changed "aFederal equivalent method" to the defined abbreviation "an FEM"; added "byUSEPA and listed in" after "and designated"; changed "in accordance with part 53 ofthis chapter" to "inthe List ofDesignated Methods, incorporated byreference in Section 243.108." 243.124(e) 50.ll(e) Changed "annual primmy standard" to "1971 primary annual average NAAQS for nitrogen oxides"; added "in subsections (a) ofthis Section" for enhanced clarity; changed "this part" to "40 CFR 50, incorporated by reference

... Section 243.108." 243.124(t) 50.1l(t) Changed "!-hourprimmy standard" to "2010 primary one-hourNAAQS for nitrogen oxides"; added "in subsection (b) ofthis Section" for enhanced clarity; changed "1-hour" to written "one-hour" (twice); changed "this part" to "40 CFR 50, incorporated byreference

... Section 243.108." 243.124(g) 50.ll(g) Changed "secondary standard" to singular "1971 secondary annual averageNAAQS for nitrogen oxides"; added "in subsection (c) ofthis Section" for enhanced clatity.
243.124 Board note 50.11 generally Added explanation ofthe derivation of Section 243.124.
243.125 heading 50.9, 50.10, and 50.15 Changed "8-hour ozone" to "ozone" to generally accommodate all ozone standards in this single provision.
243.125 50.9, 50.10, and 50.15 Replaced the existing language ofthis generally Section with that ofthe cmTesponding federal regulations.243.125(a) 50.10 heading Changed "national 8-hour primary and secondary ambient air quality standards for ozone" to singular "1997 primary and secondary eight-hourNAAQS for ozone." 243.125(a)(J) 50.JO(a) Changed "level ofthe nationalS-hour primary and secondary ambient air quality standards for ozone" to singular "1997 primary and secondary eight-hour NAAQS for ozone"; changed "a reference method" to the defined abbreviation "anFRM"; changed "this part"to "40 CFR 50, incorporated by reference

... Section 243.108"; added "byUSEPA" after "and designated"; changed "in accordance withpart 53 of this chapter" to "and listed inthe List of Designated Methods, incorporated by reference in Section 243.108"; changed "parts per million (ppm)" to the defined abbreviation "ppm"; changed "8-hour" to wtitten "eight-hour." 243.125(a)(2) 50.10(b) Changed "8-hourprimary and secondary ozone ambient air quality standards are" to singular "1997 primary and secondary eight-hourNAAQS for ozone is"; ; changed "8-hour" to written "eighthour"; changed "this patt" to "40 CFR 50, incorporated byreference

... Section 243.108."243.125(a)(3) 50.10(c) Added "USEPA has stated in corresponding 40 CFR 50.10(c) that"; changed "1997 ozoneNAAQS set fmth in paragraph (a) ofthis section" to "1997 primary and secondary eight-hour NAAQS for 0 3 set forth in subsection (b)(l) ofthis Section"; changed "1 year" to written "one year"; changed designation ofthe area" to "USEP A designation ofthat area"; changed "pursuant to section 107 ofthe Clean AirAct" to "pursuantto 42 USC 7407" and moved it from after "NAAQS" to follow "designation ofthat area"; changed "2008 ozoneNAAQS" to "2008 primary and secondary eight-hour NAAQS for ozone"· chancred "1997


### , 

### "' ozoneNAAQS" to "1997 primary and secondary eight-hourNAAQS for ozone"; changed "will continue to remain" to 

### "will remain"; removed "the promulgation of' fi·om after "notwithstanding"; changed "2008 ozoneNAAQS under" to "2008 primary and secondary eight-hourNAAQS for ozone set fmth in"; added "USEPA" before "designation"; changed "the2008 ozoneNAAQS" to "that 2008 primary and secondary eight-hourNAAQS for ozone"; moved the statementrelative to codification ofarea designations into an appended Board note. 243.125(a)(3) Board 50.10(c) Changed "area designations and note classifications with respect to the 1997 NAAQS are codified" to active-voice "USEP A has codified area designations and classifications with respect to the 1997 and 2008 primary and secondmy NAAQS for ozone" area moved the statement into this Board note; changed "40 CFRpmt 81" to "40 CFR 81.314"; added a statement relative to future removal ofthe 1997 standards when they are clearly obsolete or USEPA removes them.243.125(a) Board note 50.10 generally Added explanation ofthe derivation of this subsection (b). 243.125(b) 50.15 heading Changed "national primary and secondary ambient air quality standards for ozone" to singular "2008 plima1y and secondary eight-hour plimary and secondary NAAQS for 

### 0 3." 243.125(b)(l) 50.15(a) Changed "level ofthe nationalS-hour primary and secondary ambient air quality standards for ozone" to singular "2008 primary and secondary eight-hour NAAQS for ozone"; changed "pm1s per million (ppm)" to the defmed abbreviation "ppm"; changed "8-hour" to written "eight-hour"; changed "a reference method" to the defined abbreviation "an FRM"; changed "this pm1" to "40 CFR 50, incorporated by reference

... Section 243.108"; added "byUSEPA" after "and designated"; changed "in accordance withpa!1 53 of this chapter" to "and listed in the List of Designated Methods, incorporated by reference in Section 243.108." 243.125(b)(2) 50.15(b) Changed "8-hourprimmy and secondary ambient air quality standards" to singular "2008 plimary and secondary eight-hourNAAQS for ozone"; changed ''3-year'' to written ''three-year''; changed "8-hour" to written "eighthour"; changed "thispm1" to "40 CFR 50, incorporated byreference

... Section 243.108." 243.125(b) Board note 50.15 generally Added explanation ofthe derivation of this subsection (c).
243.126 50.12 and 50.16 generally Replaced the existing language ofthis Section with that ofthe corresponding federal regulations.243.126(a) 50.12 heading Changed "national primary and secondmy ambient air quality standards" to singulm· "1978 primmy and secondary NAAQS." 243.126(a)(l) 50.12(a) Changed "national primmy and secondary ambient airquality standards for lead

... are" to singular "the 1978 ptimary and secondary quarterly average NAAQS for lead

... is"; changed "a reference method" to the defined abbreviation "an FRM"; changed "this part" to "40 CFR 50, incorporated by reference

... Section 243.108"; added "and designated byUSEPA and listed in the List ofDesignated Methods, incorporated byreference in Section 243.108" (twice); changed "equivalent method" to the defined abbreviation "FEM"; changed "microgramspercubic meter" to the defined abbreviation, "J.Lg/m3."243.126(a)(2) 50.12(b) Changed "standards" to singular "1978 NAAQS for lead"; removed "the promulgation of' fi·om after "notwithstanding"; changed "lead national ambient air quality standards (NAAQS) in § 50.16"to singular "2008 primary and secondary NAAQS for lead in subsection (b) ofthis Section" (twice); changed "leadNAAQS" to "1978 primary and secondaryNAAQS for lead"; added "byUSEPA" after "and designated"; changed "section 107 ofthe Clean Air Act" to "42 USC 7407"; changed "leadNAAQS set forth in § 50.16" to "2008 primary and secondary NAAQS for lead set forth in subsection (b) ofthis Section"; changed "leadNAAQS set forth in this section" to "the 1978 prin1ary and secondary NAAQS for lead"; changed "the effective date of§ 50.16" to "January 12, 2009"; changed "the lead NAAQS" to "1978 primary and secondary NAAQS for lead"; changed "until that area submits, pursuant to section 191 of the Clean AirAct, and EPA approves an implementationplan"to "until USEPA has approved an implementation plan for that area pursuant to 42 USC 7415"; changed Hand or" to "or." 243.125(a) Board note 50.12 generally Added explanation ofthe derivation of this subsection (a). 243.126(b) 50.16 heading Changed "national primary and secondary ambient airquality standards" to singular "2008 primary and secondary NAAQS."243.126(b)(l) 50.16(a) Changed "national primary and secondary ambient air quality standards for lead (Pb)

... are" to singular "the 2008 primary and secondaryNAAQS for lead

... is"; changed "micrograms percubic meter" to the defined abbreviation "[.lg/m3 "; changed "3- month" to written "three-month"; changed "Pb" to "lead"; added "one of the following." 243.126(b)(I)(A) 50.16(a)(l) Changed "areference method" to the defined abbreviation "an FRM"; changed "thispa1i" to "40 CFR 50, incorporated byreference

... Section 243.108"; added "byUSEPA and listed in" after "and designated"; changed "in accordance with part 53 ofthis chapter" to "inthe List ofDesignated Methods, incorporated byreference in Section 243.108." 243.126(b)(I)(B) 50.16(a)(2) Changed "an equivalent method" to the defined abbreviation "an FEM"; added "byUSEPA and listed in" after "and designated"; changed "in accordance with part 53 ofthis chapter" to "inthe List ofDesignated Methods, incorporated byreference in Section 243.108." 243.126(b)(2) 50.16(b) Changed "national primary and secondary ambient air quality standards for Pb are" to singular "the2008 primary and secondaryNAAQS for lead is"; changed "3-month" to written "three-month"; changed "this part" to "40 CFR50, incorporated byreference

... Section 243.108"; changed "micrograms per cubic meter" to the defined abbreviation "[.lg/m3 ." 243.126(b) Board note 50.16 generally Added explanation ofthe derivation of this subsection (b).243.Table A Table 1 to 50.14(c) Moved the tabulated material from the body ofthe regulations into an appended table.
243.Table A heading Table 1to 50.14(c) Refmmatted the text fi·mn large and heading small caps to standard title text; omitted "fordata to be used in designations."
243.Table A column 1 Table 1to 50.14(c) Omitted "pollutant" and "standard," in heading column 1heading favor ofthe single entry title "NAAQS"; changed "promulgationdate" to "regulatmy citations"; and replaced the virgules separating entiies with hard returns. 243.Table A row 1 Table 1to 50.14(c) row 1 Changed "PM2
.5 /24-Hr standard" to column 1 enn·y column 1 entry "2006 24-hour PM2

_ 5"; separated the name ofthe NAAQS from the parenthetical level by a hard retum; added citations to the Illinois and coiTesponding federalmles; added the FederalRegister citation for the pertinent notice ofadopted mle.
243.Table A row 1 Table 1 to 50.14(c) row 1 Omitted the marking for endnote "a." column 3 entry column 3 enn·y 243.Table A row 1 Table 1 to 50.14(c) row 1 Omitted the marking for endnote "a." column 4 entry column 4 entry
243.Table A row 2 Table 1 to 50.14(c) row 2 Changed "ozone/8-Hr standard" to column 1 enti·y column 1 entry "2008 eight-hour ozone"; separated the name ofthe NAAQS from the parenthetical level bya hard retum; added citations to the Illinois and COITesponding federalmles; added the FederalRegister citation for the pe1tinent notice ofadopted mle.
243.Table A row 2 Table 1to 50.14(c) row 2 Omitted the marking for endnote "a" column 3 entry column 3 entry (twice); changed "occurs"to past-tense "occuned"; omitted the marking for endnote "b."243.Table A row 2 Table I to 50.14(c) row 2 Omitted the marking for endnotes "a" colunm 4 entry colunm 4 entry and "1 "; changed "occurs" to past-tense "occurred"; omitted the marking for endnote "b."
243.Table A row 3 Table I to 50.14(c) row 3 Changed "N02/I-hour standard" to colunm I entry column I enhy "20I0 one-hour niu·ogen oxides (as N02)"; separated the name ofthe NAAQS from the parenthetical level by a hard return; con·ected "80-100 PPB, final level TBD)" to "(I00 ppb)"; added citations to the Illinois and corresponding federalmles; added the FederalRegister citation for the pertinent notice ofadopted mle.
243.Table A row 3 Table I to 50.14(c) row 3 Omitted the marking for endnote "a" colunm 3 entry colunm 3 entry (tlu·ee times).
243.Table A row 3 Table I to 50.14(c) row 3 Omitted the marking for endnote "a" colunm4 enu·y colunm 4 entry (three times).
243.Table A row 4 Table I to 50.14(c) row 4 Changed "S02 /l-hour standard" to colunm 1 enu·y colunm I enu·y "2010 one-hour sulfur oxides (as S02)"; separated the name ofthe NAAQS from the parenthetical level by a hard return; corrected "50-I00 PPB, final level TBD)" to "(75 ppb)"; added citations to the Illinois and conesponding federal mles; added the FederalRegister citation for the pertinent notice of adopted mle.
243.Table A row 4 Table I to 50.14(c) row 4 Omitted the marking for endnote "a" colunm 3 enuy colunm 3 entry (tlu·ee times); changed "occurs" to pasttense "occmTed"; omitted the marking for endnote "b."
243.Table A row 4 Table I to 50.14(c) row 4 Omitted the marking for endnote "a" colunm4 enhy colunm 4 entry (tlu·ee times); changed "occurs" to pasttense "occuned"; omitted the marking for endnote "b."
243.TableA Table I to 50.14(c), Omitted the endnote explanation of endnote a unchanged effective dates since publication.243.Table A Table 1to 50.14(c), Omitted the endnote explanation of endnote b changed effective dates since publication.
243.Table A Board Table 1 generally and Added explanation ofthe derivation of note note Table A; changed "EPA notes" to "USEPAnoted"; added "the infmmation in"before "thistable"; changed "EPA" to "thatUSEPA"; added "USEPA stated that" before and "in this table" after "the general schedule"; changed "usedby EPA" to "that USEPA will use"; added explanation ofcon·ection ofUSEPA eiTors in the entries for the 2010 onehourNAAQS for sulfur oxides and 2010 one-hourNAAQS for nitrogen oxides; added explanation ofomission of endnotes "a" and "b."

Table 2: Board Housekeeping Amendments

Section Source Revision(s)
243 table ofcontents, Board Changed "Preamble" to "Scope"to agree with 243.102 heading conesponding40 C.F.R. 50.2.
243 table ofcontents, Board Added the parenthetical "(Repealed)" to accommodate 243.104 heading repeal ofthis Section, which has no direct counterpart in 40 C.F.R. 50.
243 table ofcontents, Board Added the parenthetical "(Repealed)" to accommodate 243.106 heading repeal ofthis Section, which has no direct counterpmt in 40 C.F.R. 50.
243 table ofcontents, Bom·d Changed "8-Hour Ozone" to "Ozone" to accommodate 243.122 heading consolidation ofconesponding 40 C.F.R. 50.9, 50.10, and 50.15 into a single provision.
243 table ofcontents, Board Changed "Nitrogen Dioxide" to "Nitrogen Oxides 243.122 heading (Nitrogen dioxide as Indicator)" to more closely follow the heading ofconesponding40 C.F.R. 50.11.243 table ofcontents, Board Changed "Appendix" to uppercase "APPENDIX" to 243.Appendix A comport withIllinoisAdministrative Code codification heading requirements as asserted bythe Office ofthe Secretary of State; added the parenthetical "(Repealed)"to accommodate repeal ofthis Section, which has no direct counterpart in 40 C.F.R. 50.
243 table ofcontents, Board Changed "Appendix" to uppercase "APPENDIX" to 243.Appendix B compmiwithIllinoisAdministrative Code codification heading requirements as asseJied bythe Office oftbe Secretary of State; added the parenthetical "(Repealed)" to accommodate repeal ofthis Section, which has no direct counterpart in 40 C.F.R. 50.
243 table ofcontents, Board Changed "Appendix" to uppercase "APPENDIX" to 243.Appendix C compmiwithIllinois Administrative Code codification heading requirements as asserted bythe Office oftbe Secretary of State; added the parenthetical "(Repealed)" to accommodate repeal ofthis Section, which has no direct counterpmi in 40 C.F.R. 50.
243 authority note Board Changed "Section 10" to "Sections 7.2 and 10"; replaced the obsoleteIllinois RevisedStatutes citation witb the cmTent Illinois CompiledStatutes citation.
243 source note Board Removed the obsolete citations "4 PCB 191" fiom after "R71-23" and "46 PCB 125" from after "R80-II."
243.103 Board Changed passive-voice "are applicable" to "apply."
243.104 Board Removed the provision relative to non-degradation, in order to rely on the language ofindividual federal antidegradation provisions.
243.106 Board Removed the provision, which had no direct counterpart in 40 C.F.R. 50.
243.107 Board Removed the word "except," which does not exist intbe COITesponding text of40 C.F.R. 50.3; changed "25°C" to "5° C." See the entry for this provision in Table I above.
243.102 generally Board Replaced the existing language ofthis Section with the incorporations byreference that are necessaryto support a regulation that is identical-in-substance with the federal NAAQS regulations; reformatted the incorporations by reference so that individual incorporations byreference are no longer independentlynumbered.243.102 Board Added the listing ofdocuments available from this "Government source, including appendices A-1, A-2, B, C, D, F, G, H, Printing Office" J, K, L, N, 0, P, Q, R, S, and T of40 C.F.R. 50 for the purposes ofthe provisions cited in each entry.
243.102 Board Added explanation ofon-line availability ofthe "Govemment documents. Printing Office" Boardnote
243.102 "USEPA, Board Addedthe listing ofthe document available from this National Exposure source, "List ofDesignated Reference and Equivalent Research Methods," for the purposes ofthe provisions cited in the Laboratory" ent1y.
243.102 "USEPA, Board Added the listing ofthe document available fi-om this National Exposure source, "List ofDesignated Reference and Equivalent Research Methods," for thepmposes ofthe provisions cited inthe Laboratory" ent1y; added a statementthat this reference includes no FederalRegister notices that approved methods after the date ofthe referenced version ofthe List.
243.102 "USEPA, Board Added explanation ofon-line availability ofthe National Exposure documents. Research Laboratory" Board note
243.122 heading Board Changed "Nitrogen Dioxide" to "Oxides ofNitrogen (Nitrogen dioxide as Indicator)" to more closely follow theheading ofconesponding40 C.F.R. 50.11. 243.AppendixA Board Changed "Appendix" to uppercase "APPENDIX" to heading comport withIllinois Administrative Code codification requirements as asse1ted bythe Office ofthe Secretary of State; added the parenthetical "(Repealed)" to accommodate repeal ofthis Section, whichhas no direct counterpart in 40 C.F.R. 50. 243.Appendix A Board Repealed the obsolete 1ules conversion table.243.Appendix B Board Changed "Appendix" to uppercase "APPENDIX" to heading comport withIllinoisAdministrative Code codification requirements as asse1ied bythe Office ofthe Secretary of State; added the parenthetical "(Repealed)" to accommodate repeal ofthis Section, which has no direct counte1pa1i in 40 C.F.R. 50. 243.Appendix B Board Repealed the obsolete !Uies conversion table. 243.Appendix C Board Changed "Appendix" to uppercase "APPENDIX" to heading compmiwithIllinoisAdministrative Code codification requirements as asserted bythe Office ofthe Secretary of State; added the parenthetical "(Repealed)" to accommodate repeal ofthis Section, which has no direct counterpart in 40 C.F.R. 50. 243.Appendix C Board Repealed the obsolete past compliance dates table.

Table3: Revisions to the Text ofthe Proposed Amendments in Final Adoption

Section Source Revision(s)
243.101 JCAR Changed "such standard" to "suchNAAQS." "exceedance ofa NAAQS"
243.101 JCAR Changed "the event is an event caused" to "the event is "exceptional caused." event"
243.101 "federal JCAR Added the definite miicle to "included in the List of equivalent Designated Methods." method"
243.I0I "federal JCAR Added the definite article to "included in the List of equivalent Designated Methods." method" Board note
243.101 "federal JCAR Added the defmite article to "included inthe List of reference method" Designated Methods."
243.101 "federal JCAR Added the definite article to "included in the List of reference method" Designated Methods." Board note243.101 "National JCAR Changed "applies for outdoor air" to "applies to outdoor Ambient Air 

### air." Quality Standard"
243.101 "parts per JCAR Removed the parenthetical "(immediatelybelow)." billion"
243.10I "parts per JCAR Removed "and that for 'parts per billion' (immediately million" below)."
243.101 JCAR Changed "in segments oftext" to "in text." "USEPA"
243.101 Board JCAR Corrected "C.F.R." to "CFR." note 243.102(b) JCAR Changed "such standards" to "these standards." 243.105(a)(l) JCAR Changed "such event" to "the event." 243.105(a)(2) JCAR, Con·ected "paragraph (c)(3)(D) ofthis section" to Board "subsection (c)(3)(D) ofthis Section." 243.105(b)(l) JCAR Capitalized "Events" in the topical subheading. 243.105(b)(2) JCAR, Capitalized "Displays" inthe topical subheading; Board capitalized "State"; changed "such data" to "these data"; changed "this mle"to "this Section"; changed "suchuse" to "the use"; 243.105(b)(3) JCAR, Capitalized "Fires" in the topical subheading; changed Board "such emissions" to "the emissions"; capitalized "State"; changed

**~'a** S:MP" to "an SMP." 243.105(b) Board Board Added a comma before "and (b)(3)" to offset the final note element ofa series. 243.105(c)(l) JCAR Capitalized "Notification" in the topical subheading; removed the statutory citation "[415 ILCS 5/4(g) or (r)]"; changed "which" to "that" for a restrictive relative clause. 243.105(c)(2) JCAR Capitalized "Data" in the topical subheading.
243.105(c)(2)(A) JCAR Corrected "one ofmore measured exceedance" to "one or more measured exceedances."243.105(c)(2)(B) JCAR Changed "until after USEPAnotifies" to "untilUSEPA notifies."
243.105(c)(2)(C) JCAR Changed "July lst" to "July!."
243.105(c)(2)(F) JCAR Changed "TableA to this Pmt" to "Table A ofthis Pmt" changed the subsequent reference, 'Table A to this Pmt" to "TableA." 243.105(c)(3) JCAR Capitalized "Demonstrations" in the topical subheading.
243.105(c)(3)(A) JCAR Moved "to USEPA" from after "demonstration" to follow "must submit"; added a comma before "along with its demonstration" for aparenthetical clause.
243.105(c)(3)(C) JCAR Cmrected "subsection (c)(3)(B)" to "subsection (c)(3)(C)"; corrected "40 CFR 50.!4(b)(3)(ii)" to "40 CFR 50.14(b)(3)(iii)."
243.I08(b), JCAR Removed the parenthetical "(see below)." "Appendix B to 40 CFR 50"
243 .I08(b), JCAR Corrected "243.125" to "Section 243.125." "Appendix I to 40 CFR 50" 243.!08(b), JCAR Conected "243.125" to "Section 243.125." "Appendix P to 40 CFR 50"
243.I08(b), JCAR Cmrected "243.125" to "Section 243.125." "Appendix S to 40 CFR 50" 243.120(a) JCAR Capitalized "Primary," "Secondary," and "24-Hour" in the topical subheading. 243.120(a)(3)(A) JCAR Changed the ending comma to a semicolon. 243.120(a)Board JCAR Corrected "(Dec. 22, I000)"to "(Dec. 22, 2000)." note 243.120(b) JCAR Capitalized "Primaty," "Secondary,"

**~'Annual,"** "Average," and "24-Hour" in the topical subheading.243.120(b)(1)(A) JCAR Added a comma after "incorporatedbyreference in Section 243.108" to complete offsetting the parenthetical; added the definite at1icle to "included inthe List ofDesignated Methods." 243.120(b)(1)(B) JCAR Added the definite at1icle to "included inthe List of Designated Methods." 243.120(c) JCAR Capitalized "Primary," "Secondary," '"Annual," "Average," and "24-Hour" inthe topical subheading. 243.120(c)(l)(A) JCAR Added a comma after "incorporatedbyreference in Section 243.108" to complete offsetting the parenthetical; added the definite at1icle to "included inthe List ofDesignated Methods." 243.120(c)(l)(B) JCAR Added the definite article to "included in the List of DesignatedMethods." 243.120(c) Board Board CotTected the indent level ofthe note to correspond with its note associated subsection (c). 243.122(a) JCAR Capitalized ''Primaty," "Annual," "Average," "24-Hour," "Sulfur" (twice), "Oxides, and "Dioxide" in the topical subheading. 243.122(a)(3) JCAR Added the defmite article to "included in the List of Designated Methods." 243.122(a)(4) JCAR Removed "then" from before "this must beconsidered." 243.122(a)(5) JCAR Corrected "the 1971 primary annual average and 24-hour NAAQS for sulfur oxides

... remains" to "the 1971 primary annual average and 24-hourNAAQS for sulfur 

### oxides

... remain." 243.122(a) Board Board Added "this subsection (a) is derived from 40 CFR 50.4 note (2012)." 243.122(b) JCAR Capitalized "Secondary," "Tlu·ee-Hour," "Sulfur," and "Oxides inthe topical subheading. 243.122(b)(3) JCAR Removed "then" from before "this must be considered." 243.122(b) Board Board Conectedthe indent level ofthe note to cotTespond with its note associated subsection (b).243.122(c) JCAR Capitalized "Primary," "One-Hour," "Sulfur," and "Oxides in the topical subheading. 243.122(c)(3) JCAR Corrected "aFRM" to "anFRM"; changed the em-dash in "A-2"to an en-dash in "A-2"; corrected "a FEM" to "an FEM." 243.123(a) JCAR Changed "as follow" to "as follows." 243.123(b)(l) JCAR Added the definite m1icle to "included in the List of Designated Methods"; changed the ending conuna to a semicolon. 243.123(b)(2) JCAR Added the definite article to "included in the List of Designated Methods." 243.123(c) JCAR Changed "75 percent ofthe hourly average
... are available" to "75 percent ofthe hourly average
... is available."
243.124(d)(I) JCAR Con·ected "aFRM" to "an FRM"; added the definite article to "included in the List ofDesignated Methods." 243.124(d)(2) JCAR Changed "Federal FEM"to "FEM"; added the definite micleto "included inthe List ofDesignated Methods." 243.124(e) JCAR Changed to lower-case "appendix S or40 CFR50"; added a comma after "incorporatedbyreference in Section 243.108" to complete offsetting the pm·enthetical. 243.124(f) JCAR Changed to lower-case "appendix S or 40 CFR 50"; added a comma after "incorporated byreference in Section 243.I08" to complete offsetting the parenthetical. 243.125(a) IERG, Removed the proposed subsection (a), which contained the Board 1979 primary and secondary one-hourNAAQS for ozone, and renumbered proposed subsection (b) as subsection (a); capitalized "Primmy," "Secondary," "Eight-Hour," and "Ozone" for the topical heading. 243.125(a)(l) JCAR CmTected "aFRM" to "anFRM"; added a comma after "incorporated byreference in Section 243.108" to complete offsetting the parenthetical; added the definite m1icle to "included in the List ofDesignated Methods."243.125(a)(3) Board Con·ected the "the 1997 and 2008 primary and secondary Board note IERG NAAQS for ozone" to "the 2008 primary and secondary NAAQS for ozone"; conected "40 CFR 50.9 or 50.10" to "40 CFR 50.10"; corrected "subsections (a) and (b)" to "this subsection (a)." 243.125(a) Board Board Changed "this subsection (b)" to "this subsection (a)." note IERG 243.125(b) IERG, Removed the proposed subsection (a), which contained the Board 1979 primary and secondary one-hourNAAQS for ozone, and renumbered proposed subsection (c) as subsection (b); capitalized "Primmy," "Secondary," "Eight-Hour," and "Ozone" for the topical heading. 243.125(b)(l) JCAR Added the definite article to "included in the List of Designated Methods" (twice); added a conuna after "incorporated byreference in Section 243.108" to complete offsetting the parenthetical. 243.125(b) Board Board Conected the indent level ofthe note to conespondwith its note IERG associated subsection (b); changed "this subsection (c)" to "this subsection (b)." 243.125(c) Board Board Conected the indent level ofthe note to con·espond with its note associated subsection (c); changed "this subsection (c)" to "this subsection (b)." 243.126(a) IERG, Capitalized "Primmy," "Secondary," "Qumterly," Board "Average," and "Lead" for the topical heading. 243.126(a)(l) JCAR Added the definite article to "included in the List of Designated Methods" (twice); changed "micrograms per cubic meter" to the defined abbreviation, "J.Lg/m3 ." 243.126(a)(2) JCAR CmTected "this subsection" to "this subsection (a)." 243.126(a) IERG, Capitalized "Plimary," "Secondm·y," "Three-Month," Board "Average," and "Lead" for the topical heading. 243.126(a) Board Board Co!Tected the indent level ofthe note to conespond with its note associated subsection (a).243.126(b)(!)(A) JCAR Changed to lower-case "appendix G of40 CFR 50"; added a comma after "incorporated byreference in Section 243.108" to complete offsetting the parenthetical; added the definite article to "included inthe List ofDesignated Methods." 243.126(b)(!)(B) JCAR Added the definite article to "included in the List of Designated Methods." 243.126(b)(1)(A) JCAR Changed to lower-case "appendix R of40 CFR 50." 243.126(b) Board Board CmTected the indent level ofthe note to co!Tespond with its note associated subsection (b). 243.Appendix A JCAR Removed underlining from the Sectionheading; removed heading the overstruck fmmerly centered table headings, "Appendix A" and "Rule into Section Table." 243.Appendix B JCAR Removed underlining from the Sectionheading; removed heading the overstmck formerly centered table headings, "Appendix B" and "Section into Rule Table." 243.Appendix C JCAR Removed underlining from the Sectionheading; removed heading the overstruck fmmerly centered table headings, "Appendix C" and "PastCompliance Dates."

Table 4: Requested Revisions to the Text ofthe Proposed Amendments NotMade in Final Adoption

Section Affected Source ofRequest: Requested Explanation Revision
243 authoritynote JCAR: Remove the cmmnabefore The Board consistentlyuses a "and 27" in the citation. commato offset the fmal element of a senes. 243.101 JCAR: Changethe smart quotes The Board consistently uses smart generally to straight quotes tln·oughout (92 quotes. occu!Tences).
243.101 "federal JCAR: Change "which is The Boardprefers to use "which" equivalent included" to "that is included." for a subsequentrestrictive relative method" clause.243.101 "federal JCAR: Change "which is The Boardprefers to use "which" reference method" included" to "that is included." for a subsequent restJ.ictive relative clause. 243.105(a) JCAR: Remove thepetiod at the All other topical headings that begin end ofthe one-word topical a subsection use the period, and the heading, "Requirements." Board believes the period is appropriate where the topical heading is not followed by text within the same subsection. 243.!05(b)(l) JCAR: Change "wherethe Cmresponding 40 C.F.R. Agency has demonstrated" to 50.!4(b)(l) uses "where," which is "whenthe Agency has appropriate with a situational demonstrated." condition, rather than a condition in time. 243.105(b)(2) JCAR: Change "wherethe Corresponding 40 C.F.R. Agency has demonstrated" to 50.14(b)(2) uses "where," "which" "whenthe Agency has is appropriate with a situational demonstrated." condition, rather than a condition in time. 243.105(b)(2) JCAR: Change remove the The Boardprefers to use a comma comma from before "orother to offset the final element ofa cultural events." seties. 243.105(b)(2) JCAR: Change "which satisfy" to The Boardprefers to use "which" "that satisfy." for a subsequent restrictive relative clause. 243.105(b)(3) JCAR: Change "where the Corresponding 40 C.F.R. Agency has demonstrated" to 50.14(b)(3) uses "where," "which" "whenthe Agency has is approptiate with a situational demonstJ.·ated." condition, rather than a condition in time. 243.105(b)(3) JCAR: Change the smart The Board prefers use ofthe smart apostrophe in "State's" to a apostrophe. s1J.·aight apos1J.·ophe. 243.!05(c)(l) JCAR: Change "where the Cmresponding40 C.F.R. Agency has delegated" to "when 50.14(c)(l) uses "where," "which" the Agency has delegated." is appropriate with a situational condition, rather than a condition in time.243.105(c)(1) JCAR: Change the sma1t The Boardprefers use ofthe sma1t apostrophe in "State's" to a apostrophe. straight apostrophe. 243.105(c)(l) JCAR: Remove the period at the All other topical headings that begin end ofthe topical heading, a subsection use the period, and the "Flagging ofData." Boardbelieves the period is appropriate where the topical heading is not followed bytext within the same subsection.
243.105(c)(2)(B) JCAR: Change the smart The Boardprefers use ofthe smart apostrophe in "State's"to a apostrophe. straight apostrophe.
243.105(c)(2)(B) JCAR: Change "subsection (c)(3) The Boardhas consistently added ofthis Section" to "subsection "ofthis Section" for several years at (c)(3)." the instruction ofthe CodeUnit and ICAR. The Board would prefer confinnation and consideration of this suggested stylistic revision before making it.
243.105(c)(2)(C) JCAR: Change "subsection The Board has consistently added (c)(2)(D) or (c)(2)(E) ofthis "ofthis Section" for several years at Section" to "subsection (c)(2)(D) the instruction ofthe Code Unit and or (c)(2)(E)." JCAR. TheBoard would prefer confim1ation and consideration of this suggested stylistic revision before making it.
243.105(c)(2)(F) JCAR: Change "aNAAQS" to The acronym is actually pronounced "anNAAQS." as aword, making aa" more appropriate.
243.105(c)(3)(D)- JCAR: Change the smart quotes The Board consistentlyuses smmt (i) to straight quotes throughout (two quotes. occmTences).
243.108(b), "List JCAR: Change the smmt quotes The Board consistentlyuses smmt ofDesignated

... to straight quotes (four quotes. Methods" occmTences).243.120(a) JCAR: Remove the period at the All other topical headings that begin end ofthe topical heading, "1987 a subsection use the period, and the Primary and Secondary 24-Hour Boardbelieves the period is NAAQS for PM 10." appropriate where the topical heading is not followed bytext within the same subsection. 243.120(a)(l) JCAR: Change the smatt quotes The Board consistentlyuses smart to straight quotes (two quotes. occunences). 243.120(b) JCAR: Remove the period at the All other topical headings that begin end ofthe topical heading, "1997 a subsection use the period, and the P1immy and Secondary Annual Boardbelieves the period is Average and 24-HourNAAQS for appropriate where the topical PM2.s-" heading is not followed bytext within the same subsection. 243.120(c) JCAR: Remove the pe1iod at the All othertopical headings that begin end ofthe topical heading, "2006 a subsection use the period, and the Prima1y and Secondary Annual Board believes the period is Average and 24-HourNAAQS for appropriate where the topical PM2.s-" heading is not followed bytext within the same subsection. 243.122(a) JCAR: Remove the period at the All othertopical headings that begin end ofthe topical heading, "1971 a subsectionuse the period, and the Prima1y Annual Average and 24- Board believes the period is HomNAAQS for Sulfur Oxides appropriate where the topical (as Sulfur Dioxide)." heading is not followed bytext within the same subsection. 243.122(a)(4) JCAR: Change "subsection (b) of The Board has consistently added this Section" to "subsection (b)." "ofthis Section" for several years at the instruction ofthe Code Unit and JCAR. The Board would prefer confilmation and consideration of this suggested stylistic revision before making it.243.122(a)(5) JCAR: Change "subsection (c) of The Board has consistently added this Section" to "subsection (c)." "ofthis Section" for several years at the instmction ofthe Code Unit and JCAR. The Board would prefer confitmation and consideration of this suggested stylistic revision before making it. 243.122(a) Board JCAR: Change the web address, The web address is invalid with the note "http://www.epa.gov/ mnission of"R5." so2designations/recletters/ R5

_IL 

### Jec

_wtechanalysis.pdf' to "http://www.epa.gov/ so2designations/recletters/

_IL _rec
_wtechanalysis.pdf." 243.122(b) JCAR: Remove the period at the All othertopical headings that begin end ofthe topical heading, "1971 a subsectionuse the period, and the Secondmy Tlu·ee-Hour NAAQS Board believes the period is for Sulfur Oxides (as S02)." appropriate where the topical heading is not followed by text within the same subsection. 243.122(b)(3) JCAR: Change "subsection (b)(I) The Board has consistently added ofthis Section" to "subsection "ofthis Section" for several years at (b)(!)." the instmction ofthe Code Unit and JCAR. TheBoard would prefer confitmation and consideration of this suggested stylistic revision before making it. 243.122(c) JCAR: Remove the period at the All other topical headings that begin end ofthe topical heading, "20I0 a subsectionuse the period, and the Primary One-HourNAAQS for Board believes the period is Sulfur Oxides (as S02)." appropriate where the topical heading is not followed bytext within the same subsection. 243.122(c) Board JCAR: Change "subsection (a)(5) The Boardhas consistently added note ofthis Section" to "subsection "ofthis Section" for several years at (a)(5)." the instmction ofthe Code Unit and JCAR. The Board would prefer confinnation and consideration of this suggested stylistic revision before making it.243.124(d) JCAR: Change "subsections (a) The Boardhas consistently added through (c) ofthis Section" to "ofthis Section" for several years at "subsections (a) through (c)." the instmction ofthe Code Unit and JCAR. TheBoard would prefer confitmation and consideration of this suggested stylistic revision before making it. 243.124(e) JCAR: Change "subsection (a) of The Board has consistently added this Section" to "subsection (a)." "ofthis Section" for several years at the instmction ofthe CodeUnit and JCAR. The Board would prefer confirmation and consideration of this suggested stylistic revision before making it. 243.124(£) JCAR: Change "subsection (b) of The Boardhas consistently added this Section" to "subsection (b)." "ofthis Section" for several years at the instmction ofthe Code Unit and JCAR. The Board would prefer confirmation and consideration of this suggested stylistic revision before making it. 243.124(g) JCAR: Change "subsection (c) of The Boardhas consistently added this Section" to "subsection (c)." "ofthis Section" for several years at the instmction ofthe Code Unit and JCAR. The Board would prefer continuation and consideration of this suggested stylistic revision before making it. 243.125(a) JCAR: Remove the period at the All other topical headings that begin end ofthe topical heading, "1997 a subsectionuse the period, and the Primmy and SecondaryEight- Boardbelieves the period is HourNAAQS for Ozone." appropriate where the topical heading is not followed bytext within the same subsection. 243.125(b)(3) JCAR: Change "subsection (b)(l) The Board has consistently added ofthis Section" to "subsection "ofthis Section" for several years at (b)(1)"; change "subsection ( c)(1) the instmction ofthe Code Unit and ofthis Section" to "subsection JCAR. The Board would prefer (c)(!)"; change "subsection (c) of confitmation and consideration of this Section" to "subsection (c)." this suggested stylistic revision before making it.243.125(b) JCAR: Remove the period at the All other topical headings that begin end ofthe topical heading, "2008 a subsectionuse the petiod, and the Primary and Secondary Eight- Board believes the period is HourNAAQS for Ozone." appropriate where the topical heading is not followed by text within the same subsection. 243.126(a) JCAR: Remove the petiod at the All other topical headings that begin end ofthe topical heading, "1978 a subsection use the period, and the Primaty and Secondary Qumterly Board believes the period is Average NAAQS for Lead." appropriate where the topical heading is not followed bytext within the same subsection. 243.126(a)(2) JCAR: Change "subsection (b) of The Board has consistently added this Section" to "subsection (b)" "ofthis Section" for several years at (three times). the instmction ofthe Code Unit and JCAR. The Board would prefer confim1ation a11d consideration of this suggested stylistic revision before making it. 243.126(a)(2) JCAR: Change the smm1 quotes The Board consistentlyuses smmt Board note to straight quotes (two quotes. occurrences). 243.126(b) JCAR: Remove the period at the All other topical headings that begin end ofthe topical heading, "2008 a subsectionuse the period, and the Primmy and Secondm·y Three- Boardbelieves the period is Month Average NAAQS for appropriate where the topical Lead." heading is not followed by text within the same subsection.


### ORDER
The Board directs the Clerk to provide notice in the Illinois Register ofthe following adopted amendments to the Illinois ambient air quality regulations at 35 Ill. Adm. Code 243:
TITLE 35: ENVIRONMENTAL PROTECTION SUBTITLE B: AIR POLLUTION CHAPTER 1: POLLUTION CONTROL BOARD SUBCHAPTER 1: AIR QUALITY STANDARDS AND EPISODES
PART243 AIR QUALITY STANDARDSSection 243.101 243.102 243.103 243.104 243.105 243.106 243.107 243.108

Section 243.120 243.121 243.122 243.123 243.124 243.125 243.126 SUBPART A: GENERAL PROVISIONS
Definitions PreaHialeScope Applicability Nondegradation (Repealed) Air QualityMonitoring Data Influenced byExceptional Events Monitoring (Repealed) Reference Conditions Incorporations byReference
SUBPART B: STANDARDS AND MEASUREMENTMETHODS
PM10 and PM2.s Pm1iculates (Repealed) Sulfur Oxides (Sulfur Dioxide) Carbon Monoxide Nitrogen Oxides (Nitrogen Dioxide as Indicator) g HoarOzone Lead f<j'lj'leflEiiJt243.APPENDIX ARule into Section Table (Repealed) Aj'lfleFlaiJl 243.APPENDIX B Section into Rule Table (Repealed) Aj'lj'leaEiiJt 243.APPENDIX CPast Compliance Dates (Repealed) 243.TABLE A Schedule ofExceptional Event Flagging and Documentation Submission for New orRevised NAAOS
AUTHORITY: Implementing geetioa Sections 7.2 and 10 and authorized by Section 27 ofthe Environmental Protection Act (Ill. Rev. Stat 1991, eh. Ill !J2, j'lars. 101QaaEII Q27) [ 415 ILCS 

### 517.2. 10. and 27].
SOURCE: Adopted as Chapter 2: AirPollution, Part III: Air Quality Standards, in R71-23,-4 PCB 191, flied and effective Aprill4, 1972; amended in R80-ll, 4a PCB 125, at 6 Ill. Reg. 5804, effective April22, 1982; aJnended inR82-12, at 7 Ill. Reg. 9906, effective August 18, 1983; codified at 7 Ill. Reg. 13630; amended in R91-35 at 16 III. Reg. 8185, effective May 15, 1992; amended in R09-19 at 35 Ill. Reg. 18857, effective October 25, 2011; amended in R13-ll at 37 Ill. Reg. , effective

________ _ SUBPART 

### A: GENERAL PROVISIONS


### Section 243.101 Definitions a) EJteej'lt as stateEl ia this Part aaEI anless a Eliffereat meaaiag ofa term is elear from its eoflleJll, the Elefinitioas ofterms aseEI iflthis Part shall ae the same as those aseEI ia the Ea-virofl!flefllal ProteetioaAet [415 ILCS 5] (Aet).ll) 

### All terms tfiat 8flj3ear iH tfiis Part 

### fiave tfie defiHitieHs SJ3eeified lly 35 Ill. 

### Adm. Cede ?QJ 

### er 211.
Forthe pmposes ofthis Pmt. te1ms listed below will have the meanings attributed to them in this Section. As used in this Pmt. all terms not defined in this Section will have the meaning given them bythe Act the CAA, incomorated byreference in Section 243.108: or 35 Ill. Adm. Code 201.102.
"Act" means the Environmental Protection Act [ 415 ILCS 5]. "Agency" means the Illinois Environmental Protection Agency.
"Ambient air" means that pmtion ofthe atmosphere. extemal to buildings. to which the general public has access.
"CleanAir Act" or "CAA" means the federal Clean Air Act 42 USC 7401 et. seg. as amended. incomoratedby reference in Section 243.108.
"Exceedance ofa NAAQS" means one occun·ence ofa measured or modeled concentration that exceeds the specified concentration level ofsuchNAAQS for the averaging period specified bythe standard. "Exceptional event" means an event that fulfills all ofthe following criteria:
The event affects air guality:
The event is not reasonably controllable orpreventable:
The event is caused byhuman activity that is unlikely to recur at a particular location or a natural event: and
The event is dete1mined byUSEPA in accordance with 40 CFR 50.14 to be an exceptional event.
An "exceptional event" does not include any ofthe following: Stagnation ofair masses or meteorological inversions:
A meteorological event involving high temperatures or lack of precipitation: or
Air pollutionrelating to source noncompliance.
"Federal eguivalent method" or "FEM" means a method for measuring the concentration ofan air pollutant inthe ambient air that USEPA has designated as an eguivalent method pursuant to 40 CFR 53 and which is included inthe List ofDesignated Methods. including later updates. as incorporated byreference in Section 243.108; the term "federal equivalent method" does not include a method for which USEPA has cancelled or superseded an equivalent method designation in accordance with 40 CFR 53.11 or 53.16. as reflected inthe incorporation by reference in Section 243.108. BOARD NOTE; De1ived from 40 CFR50.1 (f) (defmition of"equivalent method"). 50.ll(d)(2) (parenthetical defmition of"FEM"). and 53.1 (defmition of "federal equivalent method"). The clause "including later updates" in this definition isintended to exclude methods canceled byUSEPA pursuant to 40 CFR 53.11 or 53.16 for which the cancellation is included in the updates to List of Designated Methods inc01porated byreference in Section 243.108. A federal designation ofan FEM becomes effective upon publication ofa notice in the Federal Register. A federal cancellation ofan FEM becomes effective upon deletion from the listing ofFEMs.
"Federal reference method" or "FRM" means a method ofsampling and analyzing the ambient air for an airpollutant that USEPA has specified as a reference method in an appendix to 40 CFR 50, inc01porated byreference in Section 243.108. or a method thatUSEPA has designated as a reference method pursuant to 40 CFR 53 and which is included inList ofDesignated Methods. including laterupdates. incorporated byreference in Section 243.108; the te1m "federal reference method" does not include a method for which USEPA has cancelled or superseded a reference method designation in accordance with 40 CFR 53.11 or 53.16. as reflected inthe incorporation byreference in Section 243.108. BOARD NOTE: Derived from 40 CFR 50.l(f) (definition of"reference method") and 53 .I (definition of"federal reference method"). The clause "including later updates" in this definition is intended to include methods canceled byUSEPA pursuant to 40 CFR 53.11 or 53.16 for which the cancellation is included in the updates to List ofDesignated Methods incorporated by reference in Section 243.108. A federal designation ofan FRMbecomes effective upon publication of a notice inthe Federal Register. A federal cancellation ofan FRMbecomes effective upon deletion from the listing ofFRMs or from an appendix to 40 CFR 50. "Micrograms percubic meter" or "l!gfln3" means one millionth (1

## o·6) ofa gram of
a contaminant per cubic meter ofambient air. as measured and dete1mined bythe methods prescribed for that contaminant. BOARD NOTE: The Board added this definition and that for "milligrams per liter" (immediatelybelow). "Milligrams per cubic meter" or "mg/m3" means onethousandth (10"3) ofa gram ofa contaminant percubic meter ofambient ai.r. as measured and determined by the methods prescribed for that contaminant."National Ambient Air Quality Standard" or "NAAOS" means a standard established by USEPA that applies for outdoor air tlu·oughout the United States. BOARD NOTE: The Board added this definition. derived from the definition in "Terms ofEnvironment: Glossary. Abbreviations, and Acronyms" (December 1997). EPA 175-B-97-001. at p. 30. USEPA has codified the NAAQS at 40 CFR 50. BOARD NOTE: The Board added this definition based on the definition in "Tenus ofEnvironment: Glossarv. Abbreviations. and Acronvms" (December 1997). document number EPA 175-B-97-001. USEPA. Office of Communications. Education. and Public Affairs. at p. 30.
"Natural event" means an event in which human activity plays little or no direct causal role.
"Pmtsperbillion" or "ppb" means the ratio ofthe pmts ofa specified contaminant to a billion pmts ofair byweight (I:I

## o·9). as measured and dete1mined bythe methods prescribed for that contaminant. BOARD NOTE: The Board added this definition and that for "pmtsper million." derived from the parentheticals in 40 CFR 50.4(a) and (b) and 50.17(a) and the definition of"pmts per billion (ppb)/pmts per million (ppm)" in "Te1ms of Environment: Glossary. Abbreviations. and Acronvms" (December 1997). EPA 175-B-97-001. at p. 34.
"Pmtspermillion" or "ppm" means the ratio ofthe parts ofa specified contaminant to a million parts ofairbyweight (I:10'6). as measured and dete1mined bythe methods prescribed for that contaminant. BOARD NOTE: The Board added this definition. derived from the parentheticals in 40 CFR 50.4(a) and (b) and 50.17(a) and the definition of"pmts perbillion (ppb)/pmts permillion (ppm)" in 'Te1ms ofEnvironment: Glossary. Abbreviations. and Acronyms" (December 1997). EPA 175-B-97-001. at p. 34.
"PM10" means particulate matter that has an aerodvnamic diameter less than or equal to a nominal 10 micrometers Cum). BOARD NOTE: The Board added this definition. derived fi'om the parenthetical definition in40 CFR50.6(c). "PM,_s'' means pmticulate matter that has an aerodynamic diameter less than or equal to a nominal2.5 micrometers Cum). BOARDNOTE: The Board added this defmition. derived fi'om the parenthetical definition in40 CFR 50.7(a).
'Traceable" means that a local standard has been compared and ce1tified either directly orvia not more than one intermediate standard. to a primary standard, such as a National Bureau ofStandards Standard Reference Material (NBS SRM). or a USEPA/NBS-approved Ce1tified Reference Material (CRM).

### "USEPA" means the United States Environmental Protection Agency. BOARD NOTE: Derived from 40 CFR 50.1(c). The Board has used "USEPA" in text where USEPA has used "Administrator." where action by USEPA is clearly contemplated. Othe1wise. the Board has retained the term "Agency" as defined in this Section.
BOARD NOTE: Derived from 40 CFR 50.1 (2012). except as otherwise more specifically indicated. (Source: Amended at 37 Ill. Reg.

___ , effective---------'


### Section 243.102 Preamble Scope a) Air EjUality staRaanls are limits eR atmespherie eeReeRtratieRs efair eeRiaR'!iRaRis establishes fer the pufJ.3ese efpreteetiRgpublichealth aREl welfare. The levels ef air EjUality Elesigaatea bythe staRElaras are ElesigRea te preteet agaiRst iRjury te humaR, plaRI er arnmallife aRa they a.·e :further iRieREleate allev: maJ<imum eRjeymeRI sflife aREl preperty eeRsisteRt withthe iRieRI efthe Act. 

### a) This Pmt sets forth the NAAOS adopted byUSEPA under section 109 ofthe CAA (42 USC 7409) and incorporated into this Part pursuant to 415 ILCS 5/7.2 and lOCH). e) The first use sfeur air reseurees is te sustaiR life. Air eRieriRg the reSJ.3iratery tract mustRet meRaee health. Therefere, the air EjUality staRElarEls set must, as a millimum, previae air which will Ret aaversely affect, threugh acute er ehrerne symptems, the health efthe eommullity. AElverse health effects iReluae Ret eRly tHe !30ssiBle flFOElHetioa aeS. aggravatiea ofdisease, But alse iaterferenee \Vith eeaily :fuRetieRs. The staRaaras have alse takeR inte aeeouRI seiliRg, een·esieR, vegetatioR Elamage aREl otherhumaR effects.


### bl National primary ambient air quality standards (primaryNAAOSl define levels of air quality that USEPA has judged are necessary. with an adequate margin of safetv. to protect the public health. National secondary ambient air quality standards (secondaryNAAOSl define levels ofair quality that USEPA has judged necessary to protect the public welfare from any known or anticipated adverse effects ofa pollutant. These standards are subject to revision. and additional primary and secondaryNAAOS may bepromulgated as USEPA deems necessary to protect the public health and welfare. e) Primary ffiRBieRI air EjUality staRElaras EleHRe levels sfair EjUality which are Reeessary, with aR aEle(juate margiR ofsafety, to protectthe public health. SeeoRElary arubieRI air EjUality staRElaras EleHRe levels efair EjUality which are Reeessary to protect the public vrelfare from aRy kRowR or aRiieipatea adverse effects ofa pollutaRI.c) The promulgation ofprimmy and secondaryNAAOS must not be considered in any manner to allow significant dete1ioration ofexisting air quality in anyportion ofthis State. 

### El) Tke staRElaras are mere tkaR geals. Tke;· are legally effiereeaele limitatieRs, aRE! af!Y J3erseR eaHsmg er eeRtrieHtmg te a vielatiefl eftee staREiarEls is sH!Jjeet te eRfureemeRtj3reeeeEiiRgs HREier tee Aet. Tee staRElarEls have alse seeR ElesigReEi fur ase as a easis fer the EiB'<·eleJ3m.eflt efimj3lemeE&atieRJ3lans ey State af!aleeal ageReies fur tl>e aeatemeflt aRE! eeRtrel efJ3ellHtaRt emissieRs frem eKistiRg seHrees, aRE! fur ilie EletermiRatieR efair eefltaf!Tiflaflt eRTissieRliR>itatieRs te iRSHre tBatj3ej3ti\atieR af!a eeeRemie grewth treRaS ae Ret aaate the regieR'S air J3elh!tieR J3reelems.
BOARD NOTE: Derived from 40 CFR 50.2 (2012). (Source: Amended at 37 Ill. Reg.

____ , effective

_________ __)
Section 243.103 Applicability
The standards in this Part 

### are 8J3J3lieaele

**~tlu·oughout** the State ofIllinois, except as otherwise provided in this Pmt. (Source: Amended at 37 Ill. Reg.

____ , effective

_________ __)
Section 243.104 Nondegradation (Repealed) 

### EllistiRg aRwieflt air EttJality !Bat is settertkaR !Be estaeliskea ameieflt air EJHality staREiaras at 

### the Elate eft6eil: aElej3tieR will 

### ee fllaffitaiReEl ifl its j3reseflt higk EttJality. SHea ameieflt air Ejt!ality skall Ret ee lewerea mrless af!a Hfltil itis j3F9Vea te !Be IlliReis Ew<iref!fflefltal PreteetieR AgeRey (AgBfle;0 tkat ilie ehaRge isjHstifiaele as a resH!t efReeessary eeeRemie aRE! seeial ae'<eleJ3meflt aRE! will Ret iflterfure wit6 ereeeeme iRjHrieHs te kt!maR kealt6 erwelfare. (Source: Repealed at 37 Ill. Reg.

____ , effective

_________ __;
Section 243.105 Air Qua!itv MonitoringData Influenced bvExceptional Events a) Requirements. I) The Agency mayrequest USEPA to exclude from use in detenninations data showing an exceedance ofan NAAOS that is directly due to an exceptional event. The Agency must demonstrate to USEPA that the event caused a specific airpollution concentration at a particular air quality monitoring location. 2) A demonstration to justify data exclusion may include any reliable and accurate data, but must demonstrate a clear causal relationship betweenthe measured exceedance ofan NAAOS and the event in accordance with subsection (c)(3)(D) ofthis Section. b) Dete1minations byUSEPA. USEPA has stated the criteria for making a detem1ination to exclude data as follow: I) Exceptional Events. USEPA has stated that it will exclude data fi·om use in dete1minations ofexceedance ofan NAAOS where the Agency has demonstrated that an exceptional event caused a specific airpollution concentration in excess ofone or moreNAAOS at apa11icular air quality monitoring location. and the Agency otherwise satisfies the requirements of40 CFR50.14. 2) Fireworks Displays. USEPA has stated that it will exclude data from use in dete1minations ofexceedance ofan NAAOS where the Agency has demonstrated that emissions from fireworks displays caused a specific air pollution concentration in excess ofone ormoreNAAOS at a par1icular air quality monitoring location. and the State othe1wise satisfies the requirements of40 CFR 50.14. USEPA has stated that these data will be treated in the same manner as exceptional events under this Section. provided the Agency has demonstrated that the use offireworks is significantly integral to traditional national. etlmic. or other cultural events. including. but not limited to July Fourth celebrations. which satisfy the requirements of40 CFR 50.14. 3) Prescribed Fires. USEPA has stated that it will exclude data from use in dete1minations ofexceedance ofan NAAOS where the Agency has demonstrated that emissions from prescribed fires caused a specific air pollution concentration in excess ofone or moreNAAOS at apa1iicular air quality monitming location. and the Agency othe1wise satisfies the requirements of40 CFR 50.14. provided that the emissions are from prescribed fires that USEPA dete1mines meets the definition of "exceptional event" iri Section 243.101. and provided that the Agency has ce1iified to USEPA that the State has adopted and is implementing a Smoke Management Program (SMP) orthe State has ensured that the bumer employed basic smoke management practices. Ifan exceptional event occurs using the basic smoke management practices approach. the Agencv mustunde1iake a review ofthe State's approach to ensure public health is being protected and must include consideration ofdevelopment ofan SMP.
BOARD NOTE: In each ofconesponding 40 CFR 50.14(b)(l). (b)(2). and (b)(3). USEPA stated "EPA shall exclude data from use indetenninations of exceedances and NAAOS violations." Inthe first person. "shall" is used more to express present intent orto committo future action. The Board has changed

### "EPA shall" to "USEPA has stated that it will." Further. the Boardhas relied on the defined term "exceedance ofan NAAQS." c) Schedules and Procedures.
I) 

### Public notification. The Agency or. where the Agencyhas delegated authority pursuant to Section 4(g) or (r) ofthe Act. the Agency's delegatee. must notifythe public promptly whenever an event occurs or is reasonably anticipated to occur that may result in the exceedance ofan NAAQS. 2) Flagging ofData. A) The Agency must notifyUSEPA ofthe State's intent to exclude
one or more measured exceedances ofanNAAQS as being due to an exceptional event byplacing a flag in the appropriate field for the data record ofconcern that has been submitted to the federal air quality system (AQS) database. B) Flags placed on data in accordance with this Section must be deemed inf01mational only. and the data must not be excluded from detetminations with respect to an exceedance ofan NAAQS unless and until USEPA notifies the Agency ofUSEPA concmTence following the Agency's submittal ofa demonstration pursuant to subsection (c)(3) ofthis Section byplacing a concmTence flag in the appropriate field for the data record in the AQS database. C) Flags placed on data as being due to an exceptional event. together with an initial description ofthe event. must be submitted to USEPA not later than July 1ofthe calendar year following the year in which the flagged measurement occurred. except as allowed under subsection (c)(2)(D) or (c)(2)(E) ofthis Section. D) This subsection (c)(2)(D) con·esponds with 40 CFR 50.14(c)(2)(iv). which has expired byits own tenns. This statement maintains structural consistency with the federal regulations. E) This subsection (c)(2)(E) corresponds with 40 CFR 50.14(c)(2)(v). which has expired byits own tetms. This statement maintains stmctural consistency with the federal regulations. F) USEPA has stated that when USEPA sets aNAAOS for a new pollutant or revises the NAAQS for an existing pollutant. USEPA may revise or set a new schedule for flagging exceptional eventdata. providing initial data descliptions. and providing detailed data documentation in AQS for the initial designations ofareas for those NAAQS. Table A for this Pmt provides the existing schedule for submission offlags with initial descriptions inAQS and detailed documentation. These schedules apply for those data that will or may influence the initial designation ofareas for those NAAQS. USEPA has stated that it will revise the table upon which Table A is based as necessmy to accommodate revised data submission schedules for new orrevised NAAQS. 3) Submission ofdemonstrations. A) When the Agency has flagged data as being due to an exceptional event and is requesting exclusion ofthe affected measurement data. the Agencymust after notice and opportunity for public comment submit a demonstration to USEPA to justify data exclusion·not later than the sooner ofthree years following the end ofthe calendar qumter in which the flagged concentration was recorded or 12 months prior to the date that a regulatmy decision must be made byUSEPA. The Agency must submit to USEPA the public comments it received. along with its demonstration. B) This subsection (c)(3)(B) conesponds with 40 CFR 50.!4(b)(3)(ii). which pertains onlyto a repmting period and opportunity to demonstrate exceptions that has passed. This statement maintains structural consistency with the federal regulations. C) This subsection (c)(3)(B) conesponds with 40 CFR 50.14(b)(3)(ii), which pertains only to a reporting period and oppmtunityto demonstrate exceptional events that has passed in aprovision that has expired byits own terms. This statement maintains stmctural consistencywith the federal regulations. D) The demonstration to justify data exclusion must provide the following evidence: i) That the event satisfies the definition of"exceptional event" set fmth in Section 243.101: ii) Thatthere is a clear causal relationship between the measurement under consideration and the event that is claimed to have affected the air quality inthe m·ea; iii) Thatthe event is associated with a measured concentration in excess ofnmmal historical fluctuations. including background; and

### iv) That there would have been no exceedance or violation but for the event. E) With the submission ofthe demonstration. the Agency must document that the public comment process was followed.
BOARD NOTE: Derived from 40 CFR 50.14 (2012). (Source: Added at 37 Ill. Reg.

___ , effective----------'
Section 243.106 Monitoring (Repealed)


### Pelltltien levels 'Nil! 

### ae EletermineEI B)' 

### fiJceEI 81" 

### meaile samj3ling stffiiens aeyenEI taej3Femises SR v:aieh a seuree is leeateEI. Statiens will 

### ae leeateEI aeeerEiing te the guilEielines feF estaalisaeEI menite1ing netv:erks as Ele•;elej3eEI aythe UniteEI States EnYiwrunefltal Preteetien Agene:y. (Source: Repealed at 37 Ill. 

### Reg.

____, effective----------'
Section 243.107 Reference Conditions
All measurements ofair qualitythat are expressed as mass perunit volume (e.g

.. micrograms per cubic meter, 

### eJ<eej3t otherthan for particulate matter (PM25) 

### standards contained in Section 243.120(b) and (c) and lead standards contained in Section 243.126(b), are corrected to a reference temperature of25°_C, and to areference pressure of760 millimeters ofmercmy (I013.2 millibars). Measurements ofPM2
.5, 

### for pmposes ofcomparison to the standards contained in Section 243.120(b) and (c), and lead, 

### measure!Bents saall for purposes of compa1ison to the standards contained in Section 243 .126(b). mustbe reported based upon the actual ambient air volume measured at the actual temperature and pressure at the monitoring site during the measurement period.
BOARD NOTE: Derived from40 CFR50.3 (2012). (Source: Amended at 3 7 Ill. Reg.

____ , effective----------'
Section 243.108 Incorporations by 

### Reference
The following materials are inc01porated byreference. These inc01porations do not include any later amendments or editions: 

### a) Pararesaniline metaeEI, 40 

### CPR 50, 

### a!l!leneiK A (19&2). 

### a) l'len Elisj3ersive infraFeEI Sfleetremelfy teehniEflle, 4 0 

### CPR 50, 

### aj3j3eREiiJl 

# c (19&2), 36 

### PeEl. Reg. 22391, 

### NevemaeF 25, 1971. 

### e) Celerimelfie metheEI, 36 

### PeEl. Reg. 22396, 

### Nevenwer 25, 1971.

### El) OzeHe efk:,·leHe reaetieH metkeE!, 1Q 

### CFR §Q, 

### E!JlJ3eHElix D (1981), 36 

### FeEl. Reg. 22392, 

### J>!eveH1aer 2§, 1971. 

### e) LeaE!, 4Q 

### CFR §Q, 

### E!JlJ3eHElix G (1QQ8). f) 

### Refereaee metl1eE! fer tl1e Eletefl11iHatieH efj'lartiealate matter as 

### PM-w..ifl-.tke atmesJ3l1ere, 4Q 

### CFR §Q, 

### E!JlJ3eHElil< J (199Q). 

### g) illterJ3retatieH eftaeJ>!atieHal AmaieHt Air Qaality StaHElarE!s (NAAQS) fer J3artiealate 111atter, 4 Q

### CFR §Q, 

### E!JlJ3eHE!iJ< K, 73 

### FeEl. Reg. 6114 4

### (Oeteaer 17,

**~** 

### l1) Refereaee 111etl1eE! fer tl1e EletermiaatieH efj3artiealate matter as 

### l'Mg..ifl-.tke atmesJ3here, 4Q 

### CFR §Q, 

### E!JlJ3eHEliK L, 73 

### FeEl. Reg. 61144 

### (Oeteaer 17, 2QQ6). 

### i) illterJ3retatieH eftkeJ>!JV.QS fer I'}.<!;,.,;;, 1Q 

### CFR SQ, 

### aJ3J3eHElix J>!, 73 

### FeEl. Reg. 1497 

### (Jaooary 9, 2QQ8). j) 

### illteFJ3retatieH eftl1e J>!AAQS fer

**0~,** 4Q 

### CFR §Q, 

### aJ3J3eHElill P, 73 

### FeEl. Reg. 16436 (Mweh 27, 2QQ8). k) 

### The HAAQS fer LeaE!; FiHal Rale, 4Q 

### CFR SQ, 

### §I, §3, 

### aHa §8, 73 

### FeEl. Reg. 66964 

### (J>!evemaer 12, 2QQ8). 

### I) illterJ3retatieH eftl1e J>!AAQS fer LeaE!, 4Q 

### CFR §Q, 

### aJ3J3eaEliK R, 73 

### FeEl. Reg. 66964 

### (NeveHwer 11, 2QQ8).
Government Printing Office (GPO). 732 Capitol Street NW. Washington. DC 20401 (telephone: 202-512-1800 or 866-512-1800: website: www.gpo.gov). The following documents incmporated byreference are available from this source:Appendix A-1 to 40 CFR50 (2012) (ReferenceMeasurementPrinciple and CalibrationProcedure for the Measurement ofSulfur Dioxide in the Atmosphere (Ultraviolet Fluorescence Method)). referenced in Section 243.122. Appendix A-2 to 40 CFR 50 (2012) (Reference Method for the Detetmination ofSulfurDioxide in theAtmosphere (Pararosaniline Method)). referenced in Section 243.122. Appendix B to 40 CFR 50 (2012) (Reference Method for the Determination ofSuspendedParticulate Matterinthe Atmosphere (HighVolumeMethod)). referenced in appendix G to 40 CFR 50 (see below).Appendix C to 40 CFR 50 (2012) (Reference Measurement Principle and Calibration Procedure for the Measurement ofCarbon Monoxide in the Atmosphere (Non-Dispersive Infrared Photometry)), referenced in Section 243,]23. Appendix D to 40 CFR 50 (2012) (Reference Measurement Principle and Calibration Procedure for the Measurement ofOzone in the Atmosphere), referenced in Section 243,]25. Appendix F to 40 CFR 50 (2012) (Reference Measurement P1inciple and Calibration Procedure for the Measurement ofNitrogen Dioxide in the Atmosphere (Gas Phase Chemiluminescence)). referenced in Section 243,]24. Appendix G to 40 CFR 50 (2012) (Reference Method for the Dete1mination ofLead in Suspended Particulate Matter Collected from Ambient Air). referenced in Section 243.126. Appendix H to 40 CFR 50 (2012) (Interpretation ofthe !-HourPrimary and SecondaryNational Ambient Air Quality Standards for Ozone). referenced in Section 243.175. Appendix I to 40 CFR 50 (2012) (Interpretation ofthe 8-Hour Primary and SecondmyNational AmbientAir Quality Standards for Ozone), referenced in Section 243.125. Appendix J to 40 CFR 50 (2012) (Reference Method for the Detem1ination ofParticulate Matter as PM 10 in the Atmosphere. referenced in Section 243,]20. Appendix K to 40 CFR 50 (2012) (Interpretation ofthe Primary and SecondmyNational Ambient Air Quality Standards for Particulate Matter). referenced in Section 243.120. Appendix L to 40 CFR 50 (2012) (Reference Method for the Determination ofFine Pmticulate Matter as PM?.S in the Atmosphere), referenced in Section 243.120. AppendixN to 40 CFR50 (2012) (Interpretation ofthe Prin1m·y and Secondmy National Ambient Air Qualitv Standards for Pmticulate Matter), referenced in Section 243.120. Appendix 0 to 40 CFR50 (20 12) (Reference Method for the Determination ofCoarse Particulate Matter as PM10•25 in the Atmosphere), referenced in appendix Q to 40 CFR50 and for use infederally required monitoring bythe NCore system pursuant to 40 CFR

**~** Appendix P to 40 CFR 50 (2012) (Intetpretation ofthe Primary and SecondatyNational Ambient Aii· Quality Standards for Ozone). referenced in Section 243.125. Appendix Q to 40 CFR 50 (201 2) (ReferenceMethod for the Determination ofLead in Pmiiculate Matter as PMIO Collected from Ambient Air). referenced in appendix R to 40 CFR50. Appendix R to 40 CFR 50 (2012) (Intemretation ofthe National Ambient Air Quality Standards for Lead). referenced in Section 243.126. Appendix S to 40 CFR 50 (2012) (Intemretation ofthe PrimaryNational Ambient Air Quality Standards for Oxides ofNitrogen (Nitrogen Dioxide)). referenced in Section 243.124. Appendix T to 40 CFR 50 (2012) (Intemretation ofthe PrimaryNational Ambient Air Quality Standards for Oxides ofSulfur (Sulfur Dioxide)). referenced in Section 243.122.
Clean Air Act. 42 USC 7401 et seq. (201 I) (for definitions oftetms onlv). referenced in Section 243.102.
BOARD NOTE: Segments ofthe Code ofFederal Regulations and the United States Code are available for free download as PDF documents from the GPO FDsys website: http://www.gpo.gov/fdsys/.
USEPA. National Exposure Research Laboratmy. Human Exposure & Atmospheric Sciences Division (MD-D205-03l. Research Triangle Park. NC 2771 I. The following documents incomorated byreference are available from this source:
"List ofDesignated Reference and Equivalent Methods" (December I7. 20 12) (refetTed to as "List ofDesignated Methods" and referenced in Sections 243.IOL 243.120.243.122.243.123.243.124.243.125. and 243.126. This reference includes the no Federal Registernotices subsequent to December 17.2012 that updated List ofDesignated Methods.
BOARD NOTE: This document is available for free download as a PDF document from the USEPA. Technology Transfer. Ambient Monitoring Technology Infmmation Center website: http://www.epa.gov/ttn/amtic/ criteria.html.

### (Source: Amended at 37 Ill. Reg.

____ ., effective

_________ __, SUBPART B: STANDARDS AND MEASUREMENTMETHODS
Section 243.120 PM10 and PM2.5 a) Staflelanls. The primary aael seeeflelary aiflllieflt air EfHality staflelaffis fer PMw.are
a maKitfiHm 24 hem average eeHeefltratisfl sf 150 fl§'m". The staaelarels m·e attaifleel whea the expeeteel oomller efelays per ealefldar year ·.vith a 24 hsHr EP<erage 68fl6efltratiefl aee;·e 150**j±g,lrn~** is eEfHal te SF less than Sfle, as fl1eaSHreeJ aBel eletermmeel ifl aeeerelaflee with sHIJseetiefl (ll). ll) MeasHrefl1eflt Methed. Fereletermmiflg eeHfermaflee v:ith the PM,1l-ameieflt air Eft!ality staaelarels, PMw shall he measHreellly the metheel eleserilleel ifl 40 CFR 

### 50, appeaeliJE 

### J er aa eEft!ivaleflt methed elesigflateel flHrSHaflt te 40 CFR 53 (ineefj'lerateellly refereflee ifl Seetiefl243.108). The staflelarels are attaifleel whefl the eJEj3eeted oomller efela:,·s per ealeflelar year with a 24 heHr average eefleefltratiea alleve 150**j±g.'m~** is eEfHal ts sr less thafl Sfle, as eletermifleel ifl aeesrelaaee with 40 CFR 

### 50, appeHelix K (ifiGSf]'lsrateel eyrefereflee ifl Seetisfl 243.108). e) Staflelarels. Thepri111ary aael seesflelary amllient air Eft!ality staflelarels fer**P~.4;,.,;** tli'<* I) An ffi1ffiial arithmetie mean esHeefltratiefl ef 15.0 j±glm" aBel as measHreel aael eletermmed ifl eeHfermaflee ·.vith**st~eseetiefl** (el). 2) A maKimHm 24 hem eefleefltratiefl ef35**j±§'m~.** at tee 98thflereefltile valHe, aBel as measHred aBel datemnfleel ifl eeafermaaee ·.vita sHeseetiefl 

### fdr. el)**Meast~remeflt** Metheel fer**P~4;,.,;.** Fer eletermiiliflg eeflfermaflee ·.vita the**P~.4;,.,;** amllieflt air EfHality staflelarels,**P~.4;,.,;** shall he measHred llytee metheel eleserilleel ifl 40 CFR

### 50, aflpefleliJE L er afl eEfHivaleflt metheel elesigaateel**pt~rst~aflt** te 40 CFR 53 (meerperatedlly refereflee ifl Seetiefl243.108). Cell1]3liaflee ·.vith tee staflelarels is eletermifled Hsiflg tee metheds aBel**preeeelt~res** eleserilleel 

### ill 40 CFR 

### 50, appeHEliJE 1'1 (ifleefj'lerateellly refereflee ifl Seetiefl243.108). I) The aflfltlal fllimffi')' aBel seeeflelary**P~4;,.,;** stafldarels are met v:hefl the aflfltlal arithmetie meafl eefleefltratiefl, as eletetmmeel ifl aeeerelaflee with 40 CFR 

### 50, appeHeliJE 1'1, is less taafl er eEfHal te 15.0**j±g/m~"** 2) The 24 hemprllilary aBel seeeflelaiy**P~.4;,.,;** staflelarels are met whefl the 98thpereefltile 24 heHr eefleeflt1·atiefl, as eletermifleel ifl aeeerdaflee wita 40 CFR 

### 50, appefleliJE N, is less taafl er eEfHal te 35**!±§'m~"**a) 1987 Primary and Secondary 24-HourNAAOS for PM 10• I) The level ofthe 1987 primary and secondary 24-hourNAAOS for PM 10 is 150 l!glm3• 24-hour average concentration. The 1987 primary and secondaryNAAOS for PM10 is attained when the expected number of days per calendar year with a 24-hour average concentration above 150 u,g/m3• as determined inaccordance with appendix K to 40 CFR 50. incorporated byreference in Section 243.108. is equal to or less than one. 2) This subsection (a)(2) conesponds with 40 CFR 51.6(b). a provision marked "reserved" by USEPA. This statement maintains structural consistency with the conesponding federal regulation. 3) Forthe purpose ofdetennining attainment ofthe 1987 primary and secondary 24-hourNAAOS for PM 10• particulate mattermust be measured in the ambient air as PM10 by a method that fulfills either ofthe following requirements: A) AnFRM based on appendix J to 40 CFR 50. incomorated byreference in Section 243.108. and designated by USEPA and listed in List ofDesignated Methods. incmporated by reference in Section 243.108: or
Bl AnFEMdesignated by USEPA and listed inList ofDesignated Methods. incmporated byreference in Section 243.108.
BOARD NOTE: This subsection (a) is derived from 40 CFR 50.6 (2012). USEPA adopted 1997 primatyNAAOS for PM 10 at 62 Fed. Reg. 38652 (July 18. 1997). As a result ofa judicial vacatur. USEPA laterremoved the transitional provision relative to the 1987 NAAOS at 65 Fed. Reg. 80776 (Dec. 22. 2000) and the 1997 NAAOS at 69 Fed. Reg. 45595 (July 30. 2004). Thus. the 1987 primary and secondaryNAAOS for PM 10 are included in this subsection (a). b) 1997 Primary and Secondary Annual Average and 24 HourNAAOS for PM, 5 . 1) The 1997 primary and secondary annual averageNAAOS for PM,_5 is 15.0 l!glm3• annual aritlnnetic mean concentration. and the 1997 primar·y and secondary 24-hour NAAOS for PM, 5 is 65 u.g/m3• 24-hour average concentration. measured in the ambient air as PM,_5by a method that fulfills either ofthe following requirements: A) An FRM based on appendix L of40 CFR 50. incmporated by reference in Section 243.108. and designated byUSEPA and listed in the List ofDesignated Methods. incorporated by reference in Section 243.108: orB) AnFEM designated by USEPA and listed in the List ofDesignated Methods. incmporated byreference in Section 243.108. 2) The 1997 primary and secondary annual averageNAAQS for PM,_5 is met when the annual arithmetic mean concentration. as dete1mined in accordance with appendix N of40 CFR 50. incomorated byreference in Section 243.108. is less than or equal to 15.0 ug/m3
3) The 1997 primary and secondary 24-hourNAAQS for PM, 5 is metwhen the 98th percentile 24-hour concentration. as detennined in accordance with appendix N of40 CFR 50. incmporated byreference in Section 243.108. is less than or equal to 65 ug/m3

. BOARD NOTE: This subsection (b) is derived from 40 CFR 50.7 (2012). The 2006 primary and secondary annual average and 24-hourNAAQS for PM , 5 differs from the 1997 standards in that the 24-hour average concentration required bythe 2006 standard is substantially lower (more stringent) than that for the 1997 standard. The Board has retained the 1997 standard in this subsection (b) because USEPA has retained the 1997 standard in 40 CFR50.6. c) 2006 Primary and SecondaryAnnual Average and 24-HourNAAQS for PM, 5. 1) The 2006 primary and secondmy annual averageNAAOS for PM,_5 is 15.0 [Lg/m3• annualm·ithmetic mean concentration. and the 2006 primary and secondary 24-hour NAAQS for PM,_5 is 35 ug/m3• 24-hour average concentration. measured in the ambient air as PM,_5bya method that fulfills either ofthe following requirements: A) An FRM based on appendix L of40 CFR 50. incmporated by reference in Section 243.108. and designated byUSEPA and listed in the List ofDesignated Methods. incmporated by reference in Section 243.108: or B) AnFEM designated byUSEPA and listed in the List ofDesignated Methods. incomoratedbyreference in Section 243.108. 2) The 2006 primary and secondary annual averageNAAQS for PM, 5 is met when the annual arithmetic mean concentration. as dete1mined in accordance with appendix N of40 CFR 50. incomorated byreference in Section 243.108. is less than or equal to 15.0 ug/m3
3) The 2006 primary and secondary 24-hourNAAQS for PM, 5 is met when the 98th percentile 24-hour concentration. as dete1mined in accordance with appendix N of40 CFR50. incomorated byreference in Section 243.108. is less than orequal to 3 5 ug/m3BOARD NOTE: This subsection (c) is derived from 40 CFR 50.13 (2012). (Source: Amended at 37 Ill. Reg.

___ ., effective

_________ _, Section 243.122 Sulfur Oxides (Sulfur Dioxide)
a) Primary StaaEiarEis. The J3rHTtary aa1biem air EjUality staaEiares fer sulfur eKiaes meastrred as 

### sHlfHr HieJ:.iEle are: l) An a1111Ual aritbmeti6 meaa 6SB6effiratiea sf

## go fig.'m;; (0.03 J3J3m); aae, 2) A maKimum 24 fieur 68Beeatratiea, 11ette be eK6eeeee mere tfian e116e J3er year, ef365 fi§l.m;; (0.14 J3J3m). b) Se6eaeary Staaeare. The se6e11dary ambieffi air EjUality standard fer sulfur eKides measured as sulfur dieJdee is a BlallHTtum 3 fieur 68B6eatratie11 aette be eJ<6eedeEl
mere tfia11 8116e J3er year sf 1,300 fig.l.m;; (0.5 J3J3m). e) Measureme11t MetfieEl. fer detern1iaiag eellfem1aB6e witfi sulfur eKide air EjUality staadards, sulfur m<iees sfiall be measured as sulful· dieKide bytfie J3araresanili11e 111etfied des6ribed i11 40 CFR 50, aJ3J3eBdiK A, (iB6SFJ3srateEI by: refere116e i11 Se6tie11 243.!0g), erby an BEjUh'aleat metfied efJ3reSfaj'lJ3FSVed bytfie Agea6y. a) 1971 Primary Annual Average and 24-HourNAAOS for Sulfur Oxides (as Sulfur Dioxide (SO,)).
1) The level ofthe 1971 primmy annual averageNAAOS for sulfur oxides is 0.030 ppm. not to be exceeded in a calendar year. The annual arithmetic
mean mustbe rounded to three decimal places (fractional parts equal to or greater than 0.0005 ppmmustbe rounded up). 2) The level ofthe 1971 primmy 24-hourNAAOS for sulfur oxides is 0.14 ppm. not to be exceeded morethan once per calendar year. The 24-hour averages must be detetmined from successive non-overlapping 24-hour blocks starting at midnight each calendar day and mustbe rounded to two decimal places (fractional parts equal to or greater than 0.005 ppmmustbe rounded up). 3) Sulfur oxides mustbe measured in the ambient air as SO, bythe FRM described in appendix A-2 to 40 CFR 50. incorporated byreference in Section 243.108. orby an FEM designated byUSEPA and listed in the List ofDesignatedMethods. incorporated byreference in Section 243.108. 4) To demonstrate attainment. the annual arithmetic mean and the secondhighest 24-hour averages mustbebased uponhourly data that are at least 7 5 percent complete in each calendar quarter. A 24-hour block averagemust be considered valid ifat least 75 percent ofthe hourly averages for the 24-hour pe1iod are available. In the event that only 18-, 19-,20-,21-. 22-, or 23-hour averages are available, the 24-hourblock average must be computed as the sum ofthe available hourly averages using the number of hours (i.e

.. 18, 19, etc.) as the divisor. Ifless than 18-hour averages are available, but the 24-hour average would exceed the level ofthe standard when zeros are substituted for the missing values, subject to the rounding rule ofsubsection (b) ofthis Section, this mustbe considered a valid 24- hour average. In this case, the 24-hourblock average must be computed as the sum ofthe available hourly averages divided by24. 5) The 1971 P'imary annual average and 24-hourNAAOS for sulfur oxides set forth in this subsection (a) remains applicable to all areas notwithstanding the promulgation ofthe 2010 primmy one-hourNAAOS for sulfur oxides in subsection (c) ofthis Section. The Board will delete the 1971 primary annual average and 24-hourNAAOS for sulfur oxides set forth in this subsection (a) after fulfilhnent ofthe conditions recited by USEPA in conesponding 40 CFR 50.4(e).
BOARD NOTE: Conesponding40 CFR 50.4(e) recites that the 1971 primaryNAAOS for sulfur oxides remains effective in two tvpes ofareas for which USEPA has not yet approved an implementationplan for attainment with the 2010 primary one-hourNAAOS for sulfur oxides. The first type ofarea is one that USEPA had designated as non-attainment for that standard as ofthe effective date ofthe 20 10 primary one-hour NAAOS for the 1971 primmy NAAOS for sulfur oxides as ofthe effective date ofthe 2010 NAAOS. That date was August 23,2010. See 75 Fed. Reg. 35520 (June 22. 2010). As ofthat date, USEPAhad not designated any area inIllinois as non-attainment. See 40 CFR 81.314 (201 0). The Board is unaware ofany USEPA SIP call for any area ofIllinois relative to the 1971 primaryNAAOS for sulfur oxides. As ofDecember 31, 2012, USEPA had not vet designated the attainment status ofareas in Illinois. See 40 CFR 81.314 (2012). The Agencyrecommended that USEPA designate limited areas ofIllinois as non-attainment with the 20I0 primary one-hourNAAOS. See letter ofJune 2. 2011 from Laurel Kroack. Chief. Bureau ofAir. Agency, to Che1yl A. Newton, Director, Office ofthe Air and Radiation Division, USEPA Region 5 (available at http://www.epa.gov/so2designations/recletters/ R5 IL rec wtechanalysis.pdf). When the conditions ofthis subsection (a)(5) havebeen fulfilled, orUSEPA has removed 40 CFR 50.4, the Board will remove the standard ofthis subsection (a) as obsolete.
BOARD NOTE: This subsection (a) is derived from 40 CFR 50.4 (2012). b) 1971 SecondaryThree-HourNAAOS for Sulfur Oxides (as S02).I) The level ofthe 1971 secondarythree-hourNAAOS for sulfur oxides is 0.5 ppm. not to be exceeded more than once per calendar year. The threehour averages must be determined from successive non-overlapping threehour blocks sta1ting at midnight each calendar day and must be rounded to one decimal place (fractional pmis equal to or greater than 0.05 ppm must be rounded up). 2) Sulfur oxides mustbe measured in the ambient air as SO, bythe FRM described in appendix A-2 to 40 CFR50. incorporated byreference in Section 243.108. orby anFEM designated byUSEPA and listed in List of Designated Methods. incorporated byreference in Section 243.108. 3) To demonstrate attainment. the second-highest tlu·ee-hour average must be based upon hourly data that are at least 75 percent complete in each calendar qumier. A three-hourblock average must be considered valid only ifall three hourly averages for the three-hour period are available. If only one or two hourly averages are available. but the tlu·ee-hour average would exceed the level ofthe standard when zeros are substituted for the missing values. subject to the rounding mle ofsubsection (b)(I) ofthis Section. this must beconsidered a valid three-hour average. In all cases. the three-hourblock average must be computed as the sum ofthe hourly averages divided by tlu·ee.
BOARD NOTE: This subsection (b) is derived from 40 CFR50.5 (2012). c) ?OJO Primary One-HourNAAOS for Sulfur Oxides (as SO;,l
I) The level ofthe 2010 primmyone-hourNAAOS for sulfur oxides is 75 ppb. measured in the ambient air as SO,. 2) The 2010 one-hour primaryNAAOS for sulfur oxides is met at an ambient air quality monitming site when the tlu·ee-year average ofthe annual (99th percentile) ofthe dailymaximum one-hour average concentrations is less than or equal to 75 ppb. as detennined in accordance with appendix T of 40 CFR 50. incorporated byreference in Section 243.108. 3) The level ofthe 2010 one-hour primaryNAAOS for sulfur oxides must be measured byanFRM based on appendix A-1 or A-2 of40 CFR 50. incorporated byreference in Section 243.108. orby an FEM designated by USEPA and listed in List ofDesignated Methods. incorporated by reference in Section 243.108.
BOARD NOTE: This subsection (c) is derived from 40 CFR 50.17 (2012). The 1971 primaryNAAOS for SO, remains ineffect until the federal conditions of40 CFR 50.4(e) have beenfulfilled. as outlined in subsection (a)(5) ofthis Section and the appended Board note.(Source: Amended at 37 Ill. Reg.

____ , effective

_________ __}
Section 243.123 Carbon Monoxide 

### a) StaaEiarEis. The amhieHt air EJHality staaEiarEis fur earheameaeKiEie are: 1) A mm<imHm g heer eoaeeatratioa aotto he eJ<eeeEieEI more thaa oaee IJer year of 10 milligrams IJer et!hie meter (9 flflll'l); 

### aaEI, 2) A B1aJEiffi:Hn1 1 heHr eeaeeatfatiea aet te Se eKeeeEleEl more thaa oaee fJSr 

### year of40 milligrams IJer eehie meter (35 

### IJIJm). h) MeaserealeHt MethoEI. For EletermiHiag eoafurmaaee with the earhoa moaoJ<iEie air Ejt!ality staaEiarEI, earhoa moaoKiEie shall he measereEI hy the aoaEiisiJ8ffii..¥e inii·areEI SIJeetrometry teehHiEjt!e as EleseriheEI iR 

### 40 CFR 50, AJ3J3. C (1982), 3a 

### FeEl. Reg. 22,391, 

### l'!O':emller 25, 1971, 

### or lly aa eEJeP.·aleHt HlethoEI SfliJroveEiey the Ageaey. a) The 1971 eight-hour and one-hour primaryNAAQS for carbon monoxide are as follows:
I) Aneight-hour average concentration of9 ppm (I0 mg/m\ not to be exceeded more than once per year: and 2) A one-hour average concentration of35 ppm (40 mg/m\ not to be exceeded more than onceper year. b) The levels ofcarbon monoxide in the ambient air must bemeasured bv a method that fulfills either ofthe following requirements:
I) An FRMbased on appendix C of40 CFR 50. incmporatedbyreference in Section 243.108. and designated byUSEPA and listed in the List of Designated Methods. incmporated byreference in Section 243.108: or 2) An FEMdesignated byUSEPA and listed in the List ofDesignated Methods. incmporated byreference in Section 243.108. c) An eight-hour average concentration must be considered valid ifat least 75 percent ofthe hourly average for the eight-hourperiod is available. Inthe event that only six-hour (or seven-hour) averages are available. the eight-hour average must be computed onthe basis ofthe hours availableusing six (or seven) as the divisor. d) When summarizing data for comparison with the standards. averages must be stated to one decimal place. Comparison ofthe data withthe levels ofthestandards inppm must be made in te1ms ofintegers with fractional parts of0.5 or greater rounded up.
BOARD NOTE: This Section is de1ived from 40 CFR 50.8 (?012). (Source: Amended at 37 Ill. Reg.

____ , effective

_________ _}
Section 243.124 Nitrogen Oxides (Nitrogen Dioxide as Indicator) a) StaaEianl. The affil3ieat air Ef!ialit)' stffi!EiarEI fer ffitregea ElimtiEie is aR a!lffilal arithtnetie meaa eeaeeatratiea ef 100 mieregrams 13er et4ie meter (0.0§ !l!l!H). 13) MeasureraeatMetlleEI. F'er Elete!Tniffiag eeafennaaee with tlle aitregea ElimtiEie air Ef!ialit)' staaEiarEI, aitregea ElieJtiEie shallllea1easureEilly tlle eelerimetrie metlleEI as EleserilleEI ia 36 feEl. Reg. 22,396, }!eveffil3er 2§, 1971, erlly aa eEjuivaleat metheEI

**~!lreveEill)'** the Ageaey. a) The level ofthe 1971 primary annual averageNAAOS for nitrogen oxides is 53 ppb. annual average concentration. measured inthe ambient air as nitrogen dioxide (NO,). b) The level ofthe 2010 primmyone-hourNAAOS for nitrogen oxides is 100 ppb. one-hour average concentration. measured inthe ambient air as NO,. c) The level ofthe 1971 secondary annual averageNAAOS for nitrogen oxides is 0.053 ppm (I00 uglm\ annual m·ithmetic mean concentration. measured in the mnbient air as

**NO,~** dl The levels ofthe standards in subsections (a) tlu·ough (c) ofthis Section must be measuredby:
I) AnFRMbased on appendix F to 40 CFR 50. incmporatedbyreference in Section 243.108. and designated byUSEPA and listed inthe List of Designated Methods. incmporatedbyreference in Section 243.108: or 2) By an FEM designated by USEP A and listed inthe List ofDesignated Methods. incmporated byreference in Section 243.108. e) The 1971 primary annual average NAAQS for nitrogen oxides in subsection (a) of this Section is met whenthe annual average concentration in a calendar year is less than or equal to 53 ppb. as dete1mined in accordance with appendix S of40 CFR 50. incmporated byreference in Section 243.108. for the annual standard.
f) The 2010 one-hourprimaryNAAOS for nitrogen oxides in subsection (b) ofthis Section is met when the tlu·ee-year average ofthe annual 98thpercentile ofthe dailymaximum one-hour average concentration is less than or equal to 100 ppb.as determined in accordance with appendix S of40 CFR 50, incorporated by reference in Section 243.108, for the !-hour standard. g) The 1971 secondary annual averageNAAQS for nitrogen oxides in subsection (c) ofthis Sectionis attained when the annual arithmetic mean concentration in a calendar year is less than or equal to 0.053 ppm, rounded to tlu·ee decimal places (fractional parts equal to or greater than 0.0005 ppmmustberounded up). To demonstrate attaimnent an annual mean mustbebased uponhourly data that are at least 75 percent complete orupon data derived from manual methods that are at least 75 percent complete for the scheduled sampling days in each calendar qumter.
BOARD NOTE: This Section is derived from 40 CFR 50.11 (2012). (Source: Amended at 3 7 Ill. Reg.

____ , effective-----------'


### Section 243.125 8 IItniF 

### Ozone a) Staaaanl The p1iraary aaa seeeaaary anillieat air EJ:Uality staaaaras fer ezeae are Q.Q73 ppra (!larts perrailliea) aaily raaJtiffiaa1 8 aeHr !l'<'erage eeaeeatratiea, measHrea aaa aete1miaea ia aeeeraaaee witll. slill.seetiea (13). e) MeasmeH!eat Metll.ea. Ozeae saall ee measHrea ey a federal efiHiYaleat methea easea ea 4Q CFR 3Q, appeaaiK D aaa aesigaatea ia aeem·aaaee 

### ·.vita 4Q CFR 33 (iaeerperatea B)'refureaee ia Seetiea243 .IQ8) er aa eEJ:Uivaleat raetll.ea aesigaatea ia aeeeraaaee ·.vita 4 Q CFR 33. Theprialary aaa seeeaaaryameieat air EJ:Uality staaaaras are raet waea tae a':erage ef!Be aaaHal feHrta highest aaily raaJtia1tlra 8 heHr average ezeae eeaeeatratiea is less taaa er eEJ:Ual te Q.Q73 ppm, as aetelmiaeaHSiag 4Q CFR 3Q, appeaailt p (iaeerperatea eyrefureaee ia Seetiea 243.1Q8). a) 1997 Primarv and SecondaryEight-HourNAAQS for Ozone.
I) The 1997 hour primary and secondary eight-hourNAAQS for ozone, measured by an FRMbased on appendix D to 40 CFR 50, incorporated by reference in Section 243.108. and designated byUSEPA and listed in the List ofDesignated Methods, incorporated byreference in Section 243.108, is 0.08 ppm. daily maximum eight-hour average. 2) The 1997 primary and secondary eight-hourNAAQS for ozone is met at an ambient air quality monitoring site when the average ofthe annual fomth-highest daily maximum eight-hour average ozone concentt·ation is less than or equal to 0.08 ppm, as detetmined in accordance with appendix I to 40 CFR 50, incorporated byreference in Section 243.108.

### Fed. Reg. 66964 (Nov. 12. 2008). USEPA designated Granite City as nonattainmentwith the 2008 primary and secondary three-month average NAAQS for lead in 2010 and an area ofChicago in 2011. USEPA designated all other areas ofIllinois for the 2008 primmy and secondary three-month average NAAQS for lead in 

### 2012. See 40 CFR 81.314 (area designations in Illinois); 76 Fed. Reg. 72097. 108 (Nov. 22. 2011) (effective December 31. 2011); 75 Fed Reg. 71033.42 (Nov. 22. 2010) (effective December 31. 2010). Thus. this subsection (a) has been obsolete since December 31. 2012.
BOARD NOTE: This subsection (a) is derived from 40 CFR 50.12 (2012). b) 2008 Primary and Secondary Three-Month Average NAAQS for Lead. 1) The 2008 prima1y and secondary tln·ee-month average NAAQS for lead and its compounds is 0.15 f!gim3• 

### arithmetic mean concentration over a three-monthperiod. measured in

### the ambient air as lead by either ofthe following; A) An FRM based on appendix G of40 CFR 50. incol]lorated by reference in 

### Section 243.108. and designated byUSEPA and listed inthe List ofDesignated Methods. incorporated by reference in Section 243.108 or;
Bl An FEM designated by USEPA and listed inthe List ofDesignated Methods. incmporated byreference in Section 243.108. 2) The 2008 primary and secondary tln·ee-month average NAAQS for lead are met when the maximum arithmetic tln·ee-month mean concentration for a three-yearpe1iod. as dete1mined in accordance with appendix R of 40 CFR 50. incmporated byreference in Section 243.108. is less than or equal to 0.15 f+g/m3

. 

### BOARD NOTE: This subsection (b) is derived from40 CFR 50.16 (2012). (Source; Amended at 37 Ill. Reg.

____ , effective

_________ _; Section 243.APPENDIX A Rule into Section Table (Repealed)


### SECTIOJ>I
243.102 243.103 243.104 AJ3J3endiK C 243.1083) USEPA has stated in corresponding 40 CFR 50.10(c) that the 1997 prima1y and secondary eight-hourNAAQS for ozone set forth in subsection (b)(l) ofthis Section will no longer apply to an area for transportation conformity pmposes one year after the effective date of USEPA designation ofthat area pursuant to 42 USC 7407 for the 2008 primary and secondary eight-hourNAAQS set forth for ozone in subsection (c)(l) ofthis Section. The 1997 primary and secondary eighthourNAAQS for ozone set forth in this subsection (b) will remain applicable to all areas for all other pmposes notwithstanding the 2008 primary and secondary eiwt-hourNAAQS for ozone set fo11h in subsection (c) ofthis Section or the USEPA designation ofareas for that 2008 primary and secondary eight-hourNAAQS for ozone.
BOARD NOTE: USEPA has codified area designations and classifications with respect to the 2008 primary and secondaryNAAQS for ozone in 40 CFR 81.314. When USEPA has taken action and the conditions ofsubsection (b)(3) have been fulfilled. orUSEPA has removed 40 CFR 50.10. the Board will remove obsolete 1997 primary and secondary one-hour or eight-hour NAAQS for ozone from this subsection 

### hl
BOARD NOTE: This subsection (a) is detived fi-om 40 CFR 50.10 (2012). b) 2008 Ptimm-y and SecondaryEight-HourNAAQS for Ozone. I) The 2008 primary and secondary eiwt-hourNAAOS for ozone is 0.075 ppm. daily maximum eight-hour average. measured by an FRMbased on appendix D to 40 CFR50. incmporated byreference in Section 243.108. and designated byUSEPA and listed in the List ofDesignated Methods. incoroorated by reference in Section 243.108. or an FEMdesignated by USEPA and listed inthe List ofDesignated Methods. incoroorated by reference in Section 243.108. 2) The 2008 primary and secondary eight-hourNAAQS for ozone ambient air qualitv standards are met at an ambient air qualitymonitoring site when the tlu·ee-year average ofthe annual fom1h-highest dailymaximum eight-hour average ozone concentration is less than or equal to 0.075 ppm. as determined in accordance with appendix P to 40 CFR 50. incmporated byreference in Section 243.108.
BOARD NOTE: This subsection (b) is derived from 40 CFR 50.15 (2012). (Source: Amended at 37 Ill. Reg.

____ , effective

_________ _,

### Section 243.126 Lead a)

19) Staaaanl. The primary aaa seeeaaary aawieflt air**Eft~ality** staaaaras fer leaa aaa its eompoeaas Rleaserea as elemefltalleaa are 9.1 §**Ft!ifm~,** maJtirn.effl rolliag tlB:ee ll'lOHtfl a-verage FBeaserea aaa cletermiaecl over a tl1£ee year pe1iecl.**~i!easereFBeflt** Methocl. for cletennffiiag eoafenl'laaee 'Nitli tl!e aHthieflt air**Ejt~ality** staaElar8s fer leaEl aaEl its eOHlflOHBEis, leaEl aaEl its SOffij30UHEls shall be a1easured
as eleffleatalleacll9y fecleral OEjtlivaleat Rletl!ecll9aseclea 49 CPR §9 appeaclilt G aacl clesignatecl ia aeeorclaaee with 49 CPR §3, erlly aa OEjtlivaleat FBetllocl clesigaatecl in aeeorclaaee witl! 49 CFR §3 (iaeorperatecll9y refereaee ffi Seetioa 243.1Q8)

.. Ceai!Jliaaee witl! the primary aaa seeeaclary anwieflt air Ejt!ality staaclarcls sl!allee cletenninecl ia aeeorclaaee witl! 4Q CFR §Q, appeacliK R (ineorporatecll9y refureaee ia Seetioa243.1Q8). a) 1978 P1imary and Secondary Quarterly Average NAAQS for Lead.
1) The 1978 primary and secondary quarterly average NAAQS for lead and its compounds. measured as elemental lead by an FRMbased on appendix G to 40 CFR 50. incorporated byreference in Section 243.108. and designated byUSEPA and listed inthe List ofDesignated Methods, incorporated byreference in Section 243.108, orby an FEM designated by USEPA and listed in the List ofDesignated Methods. incorporated by reference in Section 243.108. is 1.5 ug/m3• maximum arithmetic mean averaged over a calendar quarter. 2) The 1978 primary and secondary qumterly average NAAQS for lead set fmth inthis subsection (a) will remain applicable to all areas notwithstanding the 2008 primary and secondary qumterly average NAAQS for lead in subsection (b) ofthis Section. The 1978 primm-y and secondary quarterly averageNAAQS for lead set forth in this subsection (a) will no longer applyto an area one year after the effective date ofthe designation ofthat area by USEPApursuant to 42 USC 7407 for the 2008 primary and secondary three-month average NAAQS for lead set fmth in subsection (b) ofthis Section: except that for areas designated nonattainment for the 1978 primary and secondmy qumterly average NAAQS for lead set forth inthis subsection (a) as ofJanuary 12, 2009. the 1978 primarv and secondaryNAAQS for lead set fmth in this subsection (a) will applyuntil USEPA has approved an implementationplan for that
area pursuant to 42 USC 7514 providing for attainment ormaintenance of the 2008 primary and secondary three-month average NAAOS for lead set forth in subsection (b) ofthis Section.
BOARD NOTE: The Board substituted "January 12. 2009" for the openended language in cmTesponding 40 CFR50.12(b) relative to the effective date of40 CFR 50.16. January 12. 2009 is the effective date recited at 73J% 243.107 W+ 243.121 W& 243.122 J@ ReJ3ea1eEI ,}W 243.123 

### M+ 243.124 

### J.P- 243.125 J.g 243.126 

### (Source: Repealed at 3 7 Ill. 

### Reg. , effective----------'
Section 243.APPENDIX B Section into Rule Table (Repealed)


### SBCTIOJ>!

243.101 243.102 JM 243.103 w;>, 243.104 

### JW 243.106

**~** 243.107 J% 243.121 W+ 243.122 W& 243.123 ,}W 243.124 

### M+ 243.125

**~** 243.!26 J.g 

### (Source: Repealed at 3 7 Ill. Reg. , effective --------' Section 243.APPENDIX C Past Compliance Dates (Repealed) elleej'lt as ether::ise HeteEI, eoffij3lianee '.vith this Pa1t was reEjtlireEI Ame 26, 1973. 

### (Source: Repealed at 37 Ill. Reg.

___ , effective----------'Section 243.TABLE A Schedule ofExceptional Event Flagging and Documentation Submission for New or Revised NAAQS

Air guality NAAQS data collected Eventflagging & Detailed (Levell for calendar initial descri11tion documentation Regulatory Citations year deadline submission deadline
2006 24-hour PM2
.5 2004-2006 October I, 2007 A11ril 15. 2008 (35 ug/m3) Section 243.120(c)(l) 40 CFR 50.13(a) 71 Fed. Reg. 61144 (Oct. 17. ?006)
2008 eight-hour ozone 2005-2007 June 18. 2009 June 18. 2009 (0.075 @m) 2008 June 18. 2009 June 18. 2009 Section 243.125(c)(l) 2009 60 days after the end 60 days after the end 40 CFR 50.15(a) ofthe calendar gumter ofthe calendar guatter 73 Fed. Reg. 16436 (Mar. in which the event in which the event 27. 2008) occuned orFebmary occuned orFebmary 5. 2010. whichever 5. 2010. whichever date occmTed first date occmTed first 2010 one-hour nitrogen 2008 July I. 2010 Janua!:Y 22. 20II oxides (as NOJ). 2009 July I. 2010 Janua!:Y 22. 2011 000 @b) 2010 A11ril 

### I. 20II July 

### I. 2010 Section 243.124(b) 40 CFR50.ll(b) 75 Fed. Reg. 6474 (Feb. 9. 2010)
2010 one-hour sulfur 2008 October 

### I. 2010 June 

### I. 2011 oxides (as SOJ). 2009 October 

### I. 20I0 June 

### I. 2011 (75 @b) 2010 June 

### I. 2011 June 

### I. 2011 Section 243.122(c)(l) 2011 60 days after the end 60 days after the end 40 CFR 17(a) ofthe calendar guatter ofthe calendar guarter 75 Fed. Reg. 35520 (June in which the event in which the event 22, 2010) occuned orMarch 31. occuned orMarch 31, 2012. whichever date 2012. whichever date occuned frrst occured first

BOARD NOTE: Derived from table I to 40 CFR 50.14(c) (2012). USEPA noted that the information in this table ofrevised deadlines only a@lies to data that USEPA will use to establish the final initial designations for new orrevised NAAQS. USEPA stated that the general schedule inthis table aJ1J1lies for all otherJ1utposes. most notably. for data that USEPAwill use for redesignations to attainment. Cmresponding table 1to 40 CFR 50.14(c)(2) cites the 2010 one-hourNAAOS for nitrogen oxides as "80-100 PPB. final level TBD" and the 2010 onehourNAAOS for sulfur oxides as "80-100 PPB, final level TBD." The adopted 2010 one-hour NAAOS forNOx at 40 CFR 50.11([) is 100 ppb and the adopted 2010 one-hourNAAOS for S02 is 75 ppb. The Board has used the actual NAAOS for these contaminants inthis Table A. Fmther, cmresponding table 1to 40 CFR 50.14(c) includes endnotes "a" and "b" indicate whether dates for NO, and SO, are changed orunchanged, which the Board has omitted, since endnotes will serve no purpose in the Illinois regulations. (Source: Added at 37 Ill. Reg.

___ , effective

_________ _;
IT IS SO ORDERED.

I, John Theniault, Clerk ofthe Illinois Pollution Control Board, ce1tify that the Board adopted the above opinion and order on July 25,2013, by a vote of4-0.

John Theniault, Clerk Illinois Pollution Control Board