IN" THEMATTER OF: ILLIN"OIS POLLUTION CONTROLBOARD May 16,2012 ) ) Rl3-ll . IEPA.ATTACHMENTN0.1-

.

NATIONAL AMBIENT AIR QUALITY STANDARDS, USEPA REGULATIONS (throughDecember 31, 2012) ) (Identical-in-Substance Rulemaking- Air) ) Proposed Rule. Proposal for Public Comment. OPWIONAND ORDER OFTHE BOARD (by J.A. Burke): This rulemakingupdates the ambient air quality standards in the Board's airpollution regulations (35 Ill. Adm. Code243) to make them conform with National AmbientAir Quality Standards (NAAQS) 1 adopted by the United States Environmental ProtectionAgency (USEPA) pursuantto section 109 ofthe CleanAirAct (CAA) (42 U.S.C. § 7409 (2011)). This is the initial proceeding under a new identical-in-substancemandate adopted inP.A. 97-945 (eff. Aug. 10, 2012)to ensure that Illinois' regulations reflectUSEPA's mostrecent NAAQS. TodaytheBoard adopts a proposal for public commentthatwouldreplace all existing Illinois ambient air quality standards with standards derived directlyfrom the federal NAAQS codified in40 C.P.R. 50. As explainedbelow, the Boardintends the Illinois ambient air quality standards adopted in this proceeding to be identical-in-substance withtheir federal counterparts, as "identical-in-substance" is definedby Section7.2(a) ofthe Environmental ProtectionAct (Act) (415 ILCS 5/7.2(a) (2012)). Section 10(H) ofthe Act (415 ILCS 5/!0(H), as addedbyP.A. 97-945 (eff. Aug. 10, 2012)), mandates this rulemaking requiringtheBoardto "adopt ambient air quality standards specifYingthe maximumpermissible short-term andlong-term concentrations ofvarious contaminantsinthe atmosphere; those standards shall be identical in substance to thenational ambient air quality standards promulgatedby

... the United States Environmental Protection Agencyin accordance with Section 109 ofthe CleanAirAct [(42 U.S.C. 

### § 7409)]." 415 ILCS 5/lO(H). In addition, Section 9.l(e) ofthe Actrequires the Boardto conductthis rul=aking pursuantto Section 7.2(b) ofthe Act (415 ILCS 5/7.2(b) (2012)) for adoptingrules that are "identical in substance" to the federalrequirements. Section lO(H) ofthe Act (415 ILCS 5/lO(H) (2012)) and Section l-5(c)(l) ofthe Administrative Procedure Act (APA) (5 ILCS 100/5-1-5(c)(l) (2012)) also provide that Title VII ofthe Act and Section5-35 oftheAPA (5 ILCS 100/5-35 (2012)) do not applyto this proceeding. Accordingly, the Boardwill not adopt a "First Notice" proposal, or a "Second Notice"proposal for review bytheJoint CommitteeonAdministrativeRules (JCAR). However, as provided in Section 1 O(H) ofthe Act, and as explained inthetwo following segments ofthis opinion and order, the Board, before adopting final rule amendments, will provide notice ofthis

1Throughoutthis opinion and intheregulatory text, the Boarduses the abbreviation "NAAQS" to refer to a single standard and "NAAQS" to referto multiple standards.2
mlemaking proposal in theIllinois Register, hold one public hearing on the proposal as required bythe federal Clean Air Act (33 U.S.C. 

### § 7410(a) (2011)), and allow forpublic comment.
The Board reserved this docket to accommodate the initial set ofamendments necessa1y to conform the Illinois ambient air quality standards to the federal NAAQS, as adopted and amended byUSEPA through December 31, 2012. Board action is necessmy to mnend the Illinois mnbient air quality standards to conform with the NAAQS adopted by USEPA, as amended through calendar year 2012.
The Board prefaces this opinionwithprocedural matters. First, the Board provides information onthepublic comment period. Second, the Board describes facts relative to a scheduled public hearing for this proceeding. Third, the Board sets forth the timetable for completing this mlemaking. The substantive discussions follow the procedural matters. PUBLIC COMMENTS
The Board invites public comment on the proposed mnendments. The Board will receive public comments until at least 45 days after a notice ofthese proposed amendments appears in theIllinois Register. Anyone mayfile a public comment with the Board at:
Office ofthe Clerk Pollution Control Board James R. Thompson Center 100 W. Randolph Street, Suite 11-500 Chicago, Illinois 6060I Alternatively, an interested person mayfile electronicallyusing the Clerk's Office On-Line (COOL) system, linked onthe Board's Web page, at www.ipcb.state.il.us.
All comments relating to this mlemaking, whether filed physically or electronically, should clearly refer to docket number Rl3-ll.
All filings with the Clerk ofthe Bom·d mustbe served on the hearing officer and on those persons on the Service List for this rulemaking. The service list is available on the Board'sWeb page. Before filing any document with the Clerk, please check with the Clerk's Office to confirm that you are using the most recent version ofthe Se1vice List. The hearing officer assigned to this rulemaking is Michael 

### J. McCambridge (312-814-6924, michael.mccambridge@illinois.gov).
FEDERALLY REQUIRED PUBLIC HEARING
The Board expects that the Illinois Environmental Protection Agency (Agency) will submit the present amendments as a revisionto the Illinois State Implementation Plan (SIP) for various contmninants pursuant to section 110 ofthe federal Clean Air Act (42 U.S.C. 

### § 7410(a) (2011) and the implementing USEPA regulations. See 40 C.P.R. 51.102 and appendix V (2012).3

The Board has scheduled a public hearing to occurin this rulemaking for the purpose of allowing interested members ofthe public to comment onthe proposed amendments and the anticipated SIP revision that will result from their adoption. Hearing infmmation follows:
11:00 a.m., June 26,2013 Sangamo Building, Room 1119N 1021 North Grand Avenue Springfield, Illinois
The record in this docket will include all documents pe1taining to this proceeding. All documents inthe record are publicly available for inspection and copying as provided in 2 Ill. Adm. Code 2175 (2012). Thedocuments are also freely available online at the Board's webpage: www.ipcb.state.il.us.
The record will not include a copy ofthe following documents, which are all otherwise publicly available:

• The FederalRegisternotice relating to this action (referenced elsewhere in this opinion and order);
• Federal statutes andregulations referenced in this opinion and order; and • Illinois statutes and regulations referenced in this opinion and order.
The Board will cause publication ofa Notice ofPublic Infmmation onProposed Rules in theIllinois Register. In thatNotice, the Board will describe the hearing date and time outlined above and set forth infmmationto aid members ofthe communityto obtain and review documents and participate in this proceeding. The Board will tryto have that publication occur simultaneous withpublication ofthe Notice ofProposed Amendments. The notices published relative to this proceeding will request that interested persons direct questions to the following person: Michael McCambridge, StaffAttomey Pollution Control Board I00 WestRandolph Street, Room 11-500 Chicago, Illinois 6060I 219-814-6924 michael.mccambridge@illinois.gov4

The notices published relative to this proceeding will direct interested persons to request documents from or submit documents to the following person: JohnT. Therriault, Assistant Clerk ofthe Board Pollution Control Board 100 West Randolph Street, Room 11-500 Chicago, Illinois 6060I 219-814-3629 john.theniault@illinois.gov
After the hearing and public commentperiod, the Board will promptlyissue an opinion and order adopting final rule amendments. The Board will then file the amendments with the Office ofthe Secretary ofState, and a Notice ofAdopted Amendments will appear in theIllinois Register. Any Agency submission ofthe associated SIP revision to USEPA will follow that Notice.
DUE DATE AND SCHEDULE FOR COMPLETION
The Board must complete action to adopt amendments within one year ofthe date when USEPAhas revised the NAAQS. 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 mustbe completed before August I0, 2013. Fulfilling the one-year mandate before that date will require proceeding according to the following schedule:
Due date: Proposal adopted date: Publication submission deadline: Illinois Register publication date: Public hearing date: End of45-daypublic commentperiod: Adoption date: Possible filing and effective date: PossibleIllinois Registerpublication date: August 10, 2013 May 16,2013 May20, 2013 May 31,2013 June 26, 2013 July 15, 2013 July 25, 2013 August 5, 2013 August 15,2013
This estimated timetable ofintermediate activities towards completion ofthe amendments has time added to allow for anyminorunforeseen delays in finalizing the amendments. Nevertheless, progress could occur more slowly-up to the statutory deadline of August I0, 20 13-dueto presentlyunforeseen events.
OVERVIEW OF THE FEDERAL NAAQS AND THIS PROCEEDING
The amendments proposed today are intended to make the Illinois ambient air quality standards identical-in-substance to the NAAQS adopted byUSEPA. Today's proposal includes5

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 7 Overview ofthe Federal NAAQS 8 The Section 1 O(H) Mandate and the Federal Regulations Included 8 Replacing the Existing Illinois Ambient Air Quality Standards 9 Retaining the Existing Illinois Structure: Combining a Ctiteria 10 Pollutant Use ofthe SingularorPlural to Refer to Primary and Secondary 10 NAAQS StandardizedNaming ofEachNAAQS 10 Removal ofTwo Illinois Rules 12 Removal ofthe "Nondegradation"Rule 13 Removal ofthe "Monitoting" Rule 13 Inclusion ofPresctibed Methods, Required Interpretations, and Special- 14 CaseMethods List ofDesignated Methods 14 Incorporation ofDesignated Methods 15 References to Methods inthe Text ofthe NAAQS 16 Standardization ofTerms: FRMs, FEMs, and List ofDesignated 16 Methods Codified andNon-Codified FRMs 17 Non-Codified FEMs 19 The Difference Between FRMs and FEMs 19 Inte1pretations: Conventions for Data Management and Analysis 20 The Special Case FRMs ofAppendices B, 0, and Q 21 Appendix B: FRM for Total Suspended Pmticulate Matter 21 Appendix 0: FRM for Coarse Particulate Matter (PM 10

_ 2

_

5) 22 Appendix Q: FRM for Lead inParticulate Matter (PM 10) 23 SummaryTabulation ofthe NAAQS and Supp01ting Appendices 23 NAAQS for Sulfur Oxides 23 NAAQS for PM 10 and PM25 24

### 6
NAAQS for Carbon Monoxide 24 NAAQS for Ozone 25 NAAQS for Nitrogen Oxides 25 NAAQS for Lead 26 Non-NAAQS Required Monitoring 26 Summary re Incorporation ofthe FRMs, FEMs, and Interpretations 26 Codified FRMs 26 Non-Codified FRMs 26 Non-Codified FEMs 27 Interpretations 27 The Special-Case FRMs 27 Omission ofAncillary Federal Regulations in 

### 40 C.P.R. 53, 58, and 81 27 Revisions to USEPA Defmitions/Definitions Added 28 Shifted Meanings and Revisions to the Preamble 28 Changes in Defmed Tem1s 29 Added Defined Terms 29 Omitted Defmed Terms 30 USEPA Rules Added/State Provisions Removed 31 Incorporation ofthe NAAQS for the Six Critetia Pollutants 33 Section 243.120: Pm1iculate Matter 33 Section 243.122: Sulfur Oxides 37 Sunset Clause for the 1971 Prinlmy 24-HourNAAQS for Sulfur 39 Oxides Option I: Retain the Entire Federal Text with Minimal Deviation 40 Option 2: Replace the Statement ofInapplicability and Delete One 41 Exception Statement. Option 3: Replace the Statement ofInapplicability with a Statement 42 That the Board Will Remove the 1971 NAAQS When Conditions Are Fulfilled Option 4: Replace the Statement ofInapplicability with a Statement 43 That the Board Will Remove the 1971 NAAQS When USEPA Makes Area Designations Underthe 2010 One HourNAAQS or Removes the 1971 NAAQS Option 5: Remove the Sunset Provision in Its Entirety 43 Selection ofOption 3 437



### Section 243.123: Carbon Monoxide 44 Section 243.124: Nitrogen Oxides 46 Section 243.125: Ozone 47 Sunset ofthe 1979 Primary and Secondary One-HourNAAQS for 50 Ozone Pa11ial Sunset ofthe 1997 Primary and Secondary Eight-Hour 50 NAAQS for Ozone Section 243.126: Lead 50 1978 Primary Calendar Quarterly Average NAAQS for Lead 52 Non-Inclusion ofthe 2012 NAAQS for PM2.5 

### and dPM 10 

### 52 Requests for Public Comments 55 Deviations from the Literal Text ofthe Federal Amendments and Non- 56 Federally De1ived Corrections and Clarifications Tabulations ofDeviations from the Literal Text ofthe Federal Amendments 56 and Miscellaneous Board Housekeeping Amendments Table 1: Deviations from the Text ofthe Federal Rules Table 2: Board Housekeeping Amendments ORDER (Text ofthe Amendments)
The Context ofThis Identical-in-Substance Proceeding 

### 57 91 94

The Board does not engage in substantive review offederal standards in the context ofan identical-in-substance proceeding. Rather, the Board reviews federal standards only to the extent necessaryto make a "best fit" for those standards in the context ofthe Illinois regulatory scheme.
The Board tlies to follow the structure and content offederal regulations where possible. This ensures the full incorporation ofall necessary elements ofthe present federal standards, and it makes updating the regulations easier when future federal amendments occur. Depa11ures from the federal stmcture may occur for a valiety ofreasons and will be noted as needed below. Where more st1ingent pre-existing State standards exist that will continue in effect after incorporation offederal elements, the Board will incorporate a stmcture 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 State regulations); Safe Drinking Water Act Regulations, R88-26 (Aug. 9, 1990), slip op. at 6-7 (retaining more stringent pre-existing State regulations within the body of new federal requirements).8

Overview ofthe Federal NAAOS
The federal CAA requires USEPA to assemble a list ofairpollutants that "cause or contribute to airpollution which mayreasonably be anticipated to endangerpublic health or welfare." 42 U.S.C. 

### § 4208(a)(l) (2011). Thepurpose is to establish national p1imary and secondary NAAQS. A primaryNAAQS is intended to protectpublichealth, and a secondary NAAQS is intended to protect public welfare. 42 U.S.C. § 4209(b) (2011). USEPAis required to periodicallyreview eachNAAQS and revise it where USEPA determines that revision is necessary. USEPA is further required to establish an independent technical advismy committee to aid the periodicreviews ofeachNAAQS. 42 U.S.C. 

### § 4209(d) (2011).
To date, USEP A has designated six "criteria"pollutants for establishment ofprimary and secondary NAAQS:
Carbon monoxide (CO) (see 40 C.P.R. 50.8 (2012)); Lead (Pb) (see 40 C.P.R. 50.12 and 50.16 (2012)); Nitrogen oxides (NOx) (see 40 C.P.R. 50.11 (2012)); Ozone (OJ) (see 40 C.P.R. 50.9 and 50.15 (2012)); Particulate matter (PM) in various, evolving, standards: Particulate matter (PM) (see 40 C.P.R. 50.6 (1986)); Pm1iculate matter with an aerodynamic diameter of 10 micrometers (f.lm) or less (PMw) (see 40 C.P.R. 50.6 (2012)); and Particulate matter with an aerodynamic diameter of2.5 micrometers (f.lm) orless (PM2
.5) (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 10(H) Mandate and the Federal Regulations Included ByP.A. 97-945, the General Assemblyhas created a new identical-in-substance mlemaking subjectmatter. 2 Effective August 10,2012, the General Assemblyrevised 415 ILCS 

### 517.2 and 10 to require the Board to adopt mles that are identical-in-substance to regulations adopted byUSEPApursuant 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 the principal focus ofthis proceeding. The Board, however, must consider exactlywhich segments of40 C.P.R. 50 are required and whether segments ofotherfederal regulations are necessary to 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 monitoring 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 theNAAQS for sulfur dioxide). The second segment is the body ofmles that prescribe therequirements for assembling, maintaining,

2 The stated purpose was to facilitate adoption ofthe federal NAAQS and the airpermitting 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 27.9

and operating an ambient air monitoring network-i.e., prescribing when, where, and how to use the required monitoring and testing methods. See 40 C.F.R. 58 (2012). The third segment is the series ofUSEPA area designations, which define the monitoring areas within each state, and which classify the attainment ornon-attaimnent status ofeach air monitoring area for each criteria pollutant. See 40 C.F.R. 81 (20 12). The applicability ofmany olderNAAQS is detennined byreliance onthose area designations. See, e.g., 40 C.F.R. 50.4(e), 50.9(b), and 50.12(b) (2012) (cmresponding with 35 Ill. Adm. Code 243.122(a)(5), the 1971 primmy NAAQS for sulfur oxides; 243.125(a)(2), the 1997 one-hour primary and secondaryNAAQS for 

### 0 3 ; and 243.126(a)(2), the 1978 p1imary and secondaryNAAQS for lead, respectively). Replacing the Existing Illinois AmbientAir 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 corresponding federal NAAQS. See Proposed Air Quality Standards, R72-7 (July 10, 1975), slip op. at 4-5, 14 (initial Board adoption ofmnbient air quality standards). The Board intended no more stringent State standard in the Illinois ambient air quality regulations. See !d. at 4-5 (observing adoption ofthe federal standards absent a reason to differ).
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) (Second Notice opinion and order), slip op. at 4-8, 16; see also Air Oualitv 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 State requirements that are more stringentthan the federal NAAQS, and they do not include all ofthe current federal NAAQS.
The mandate ofSection lO(H) ofthe Act (415 ILCS 5/lO(H) (2012)) arose inthis context. The mandate requires that the Board adopt standards that are identical-in-substance to the federal NAAQS. The mandate further allows the Board to adopt more stringent State standards by generalmlemaking. See 415 ILCS 5/lO(H) (2012).
The Act generally requires that identical-in-substance mles closely follow the language and stmcture ofthe cmresponding 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), R93-10 (Sept. 15, 1993); Safe Drinking Water Act Regulations, R88-26 (Aug. 9, 1990), at 6-7; Pretreatment Regulations, R86-44 (Dec. 3, 1987), at 7, 12, 23.
Since there 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 structure and language ofeach federal NAAQS. Fmther, retaining the structure and language ofthe individualNAAQS will facilitate future updates to the Illinois regulations as the federal NAAQS continue to evolve. TheBoard proposes to replace the structure and language ofthe existing Illinois ambient air quality standards with that ofthe federal NAAQS.10

Forthe foregoing reasons, the Boardhas 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 structureand language ofthe federalmles. There are deviations discussed throughout this opinion and order. The Board notes tlu·ee ofthe exceptions here. Retaining theExisting Illinois Structure: CombiningAll NAAQS for a Criteria Pollutant. The Board has combined the multipleNAAQS for each criteria pollutant into a single provision. Thus, the primary and secondaryNAAQS for PM10 and PM2.s from 40 C.F.R. 50.6, 50.7, and 50.13 are combined in Section 243.120; the NAAQS for sulfuroxides fi·om 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 (conesponding 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 (conesponding with 35 Ill. Adm. Code 243.123).
Use ofthe Singular or Plural to Refer to Primarv and Secondarv NAAQS. USEPA often uses the plural to refer to p1imary and secondaryNAAQS whereboth are embodied in a single standard. See, e.g., 40 C.F.R. 50.6(a) (1987 primary and secondary24-hourNAAQS for PM10) and 50.9(a) (1997 prin1ary and secondary one-hourNAAQS for ozone). The Board has consistently used the singularto refer to NAAQS that embody the primary standard and the secondary standard in a single number, which the Board perceives as a single ptimary and secondary standard. See, e.g., 35 Ill. Adm. Code 243.120(a)(l) and 243.125(a)(1) (conesponding with the above-cited federal NAAQS). Onthe other hand, the Board has used the plural where two separate numerical standards are presented. For example, the provisionthat recites the 2010 NAAQS for nitrogen oxides includes a one-hourprimaryNAAQS and an annual average secondaryNAAQS. See 40 C.F.R. 50.ll(b) and (c) (2012). See 35 Ill. Adm. Code 243.124(b) and (c) (conesponding with 40 C.F.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.F.R. 50.8(a)(1) and (a)(2) (2012).
Standardized Naming ofEach NAAOS. To accommodate the combined structure and clarify the rules, the Board has standardized the names for eachNAAQS. The Boardstandardized names indicate the year that USEPA adopted each standard. Eachname indicates whether the standard is a primary standard, a secondary standard, orprimary and secondary standard. Eachname indicates the duration ofeach reported monitoring result-"annual average," "quarterly average" (or "three-month average"), "24-hour," "eight-hour," "three-hour," or "one-hour."3 Each ofthe standardized names states "NAAQS" followed bythe name ofthe

3 The monitoring for eachNAAQS occurs over specific petiods, the monitoring results are analyzed in specific ways, and the results are reported in a time-period-analyzed basis. Thus, some oftheNAAQS are repmted and considered on a quarterly or annual-average basis. See, e.g., 40 C.F.R. 50.4(a) (1971 ptimary annual average NAAQS for sulfur oxides) and 50.12(a)11
particular criteria pollutant-i.e., "carbon 

### 1nonoxide," "lead," :nitrogen oxides," "ozone," "PM 10" or "PM2.5,'' or "sulfur oxides." These standardized names are rigidly applied throughout the text ofthe rules, and they are consistently used throughout this opinion. Thus, each standardized name for theNAAQS is structured 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 individualNAAQS, organized on a prioritypollutant-byprioritypollutant basis, explains the Board's selection ofeach standardized name. Using the above-described convention, the standardized NAAQS names (together with the corresponding citations to them inthe Illinois and federal rules) are tabulated as follows:
Patiiculate matter (PM): Standardized Name 35 Ill. Adm. Code 40 C.F.R. "1987 primary and secondary 24-hour NAAQS for 243.120(a) 50.6 PMw" "1997 primary and secondary annual average 243.120(b) 50.7 NAAQS for PMz.s" "1997 primary and secondary 24-hourNAAQS for 243.120(b) 50.7 

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

### PMz.s" "2006 primary and secondary 24-hour NAAQS for 243.120(c) 50.13 PM2.s"
Sulfur oxides: Standardized Name 35 Ill. Adm. Code 40 C.F.R. "1971 primmy annual averageNAAQS for sulfur 243.122(a) 50.4 oxides" "1971 primary24-hourNAAQS for sulfur oxides" 243.122(a) 50.4 "1971 secondmythree-hourNAAQS for sulfur 243.122(b) 50.5 oxides"

(2008 primary and secondary three-month averageNAAQS for lead). Some are reported on a short-tennbasis ofa one-, three-, eight-, or24-hour average. See, e.g., 40 C.F.R. 50.4(a) (1971 primary 24-hourNAAQS for sulfur oxides), 50.5(a) (1971 secondary three-hour NAAQS for sulfur oxides), 50.8(a) (1971 primary eight-hourNAAQS for carbon monoxide), and 50.13(a) (2006 primary and secondary 24-hourNAAQS for PM2.5). Inthe instance ofthe short-te1m averages, the Board has omitted the word "average" when creating a standardized name.

### 12

"2010 p1imary one-hourNAAQS for sulfur 243.122(c) oxides"


### Carbon monoxide: StandardizedName 35 Ill. 

### Adm. Code "1971 eight-hour and one-hourNAAQS for carbon 243.123 monoxide" Nitrogen oxides: Standardized Name 35 Ill. Adm. Code "1971 prima1y annual average NAAQS for 243.124(a) nitrogen oxides" 

### "2010 p1imary one-hour NAAQS for nitrogen 243.124(b) oxides" 

### "1971 secondary annual average NAAQS for 243.124(c) nitrogen oxides"
Ozone: 50.17

40C.F.R. 50.8

40 C.F.R. 50.11(a) 50.1l(b) 50.1l(c)

StandardizedName 35 Ill. Adm. Code 40 C.F.R. "1997 primmy and secondary one-hourNAAQS for 0 3" 

### "1997 primary and secondary eight-hour NAAQS for 0 3" 

### "2008 primary and secondm·y eight-hour NAAQS for 

### 0 3"


### Lead: 243.125(a) 50.9 243.125(b) 50.10 243.125(c) 50.15

Standardized Nmne 35 Ill. Adm. Code 40 C.F.R. "1978 primmy and secondary quarterly average 243.126(a) 50.12 NAAQS forlead" 4 

### "2008 primmy and secondary three-month average 243.126(b) 50.16 NAAQS for lead"

Removal ofTwo Illinois Rules 

### The removal oftwo existing Illinois rules requires briefspecific discussion. The principal reason for their removal is that these rules are not directly derived from the federal

4 

### This assumes that the Board does not omit the 1978 primary and secondmyNAAQS for lead, as is discussed beginning on page 52 ofthis opinion and order.13
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" rule, the Board does not want misunderstanding to arise bythe removals.
Removal ofthe "Nondegradation" Rule. The non-degradation rule predates the Environmental Protection Act. The Board adopted the mle from earlier rules ofthe Air Pollution Control Board. See Emission Standards, R71-23 (Apr. 13, 1972), slip op. at 44-45. When adopting the rule, the Board explained that non-degradation "embodies the principle

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

### !d. Therule itselfis less clear than that briefdescription. The Board proposes removing the non-degradation clause of35 Ill. Adm. Code 243.104 because (1) it might conflict with a newly added federalmle; (2) it is not necessary in the context ofNAAQS; and (3) it is not possible to con·ect its flaws in the context of this proceeding. Initially, the non-degradation clause mayconflict the federal non-degradation requirement in 40 C.F.R 50.2(c) that the Board proposes to incorporate at 35 Ill. Adm. Code 243.102(c). That statement, added to the Illinois rules, is as follows: "Thepromulgation of primary and secondaryNAAQS must not be considered in any manner to allow significant deterioration ofexisting air quality in any pmtion ofthis State." 35 Ill. Adm. Code 243.102(c). To the extent that the clause relates to theNAAQS themselves, the differences between the Illinois rule and the newly added federal statement could conflict. Furthermore, byincorporating the federal language in 35 Ill. Adm. Code 243.102(c), the Illinois rules retain the intent of35 Ill. Adm. Code 243.104 that air quality inIllinois will not be degraded. Second, the Board views non-degradation as directly related to airpermitting, 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 principle embodied in the federal Prevention ofSignificant Degradation (PSD) requirements. See 42 U.S.C. §§ 7470 etseq. (2011); 40 C.P.R. 51.166 and 52.21 (2012). Finally, the language ofthe mle is flawed. The opening statement imposes no requirement. Use ofthe word "willbemaintained" 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" in place of"lowered" would remove this ambiguity. TheBoard cannot amend the rule inthis way inthe context ofthis identical-in-substance proceeding.
Removal ofthe "Monitoring" Rule. Existing 35 Ill. Adm. Code 243.106 requires the use offixed or mobile monitoring 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.P.R. 58. See 40 C.P.R. 50 (2012).
The Boardhas removed the Illinois monitoring provision for several reasons. Initially, while impmtant to implementation ofthe NAAQS, this provision is not a necessary segment of14

theNAAQS themselves. USEPA codified the monitoring network requirements separately from theNAAQS. Fmther, the authorityusedbyUSEPA for adoption ofthe monitoring network requirements does not include "Section I09 ofthe Clean Air Act" as required bythe present identical-in-substance mandate. See 415 ILCS 5/IO(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-implementing. See, e.g., 40 C.F.R. 50.10(a) and 50.ll(a) (2012). Thus, no Illinois provision is necessary in this regard. Third, the vmious NAAQS require monitoring in compliance with specified procedures that incorporate the federal standards for design, location, and operation ofmonitoring networks. Those standards are referenced in several ofthe methods and procedures required for monitoring. See Appendices AI, 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). Nevertheless, should the record indicate that the Board must retain a provision relative to design, location, and operation ofmonitoring stations, the Board could retain 35 Ill. Adm. Code 243.106 revised to read as follows:
All monitoringperformed to fulfill the requirements ofthis Pmt must be perfmmed at stations and networks ofstations designed, located, and operated according to plans approved byUSEPA 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 indemonstrating compliance with each NAAQS. The methods that the standm·ds require for dete1mining compliance are an essential aspect ofthe federal NAAQS. Different methods canproduce different measurements. Thus, USEPA has specified the methods required for use and reserved authmity to itselffor approval ofalternative methods.
The approved methods are oftlu·ee types: (1) codified reference methods, (2) USEPAdesignated reference methods, and (3) USEPA-designated equivalent methods. EachNAAQS refers to a reference method that is codified in an appendix to 40 C.F.R. 50. Many ofthe NAAQS further allow the alternative use ofanother USEPA-designated reference method. OtherNAAQS allow the alternative use ofa USEPA-designated equivalent method. USEPA has fu1ther added appendices to 40 C.F.R. 50 that recite data handling conventions for some ofthe NAAQS. Thefollowing paragraphs outline the considerations relative to inclusion ofthese various methods-related materials into lllinois NAAQS rules.
List ofDesignated Methods. USEPA designates methods for use in monitoring ambient air quality byprescribed 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

5 The Board would nmmally incorporate 40 C.F.R. 58 byreference when imposing its requirements. TheBoard, however, does not believe that incorporation by reference is necessary when requiring use ofa planthat is approved byUSEPA as compliant with40 C.F.R. 58.15

the date ofFederalRegister publication. 40 C.P.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 ofDesignated Methods). 40 C.P.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 information items: (1) the method type; (2) the method source; (3) the method title; (4) a description ofthe method procedure, which may include notes on use ofthe method; (5) one or more citations to Federal Register notices 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 summary form, including a "method code" number. Finally, the List ofDesignated Methods includes a listing ofmethods sources and contact infmmation. 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.
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 equivalentmethods on the Technology TransferNetwork, Ambient Monitming Technology Infom1ation 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 For example, the December 17, 2012 version ofthe List added equivalent methods designatedbyUSEPA on September 11,2012 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 byreference all USEPA methods designations into the IllinoisNAAQS mles. For those methods listed in the List ofDesignated Methods, the incorporationbyreference in 35 Ill. Adm. Code 243.108 will rely onthe latest version ofthe List to identify the methods designated for eachNAAQS. For those methods that have not yet appeared inthe List as ofthe date ofadoption offuture amendments, the Board will include incorporationbyreference to theFederalRegister 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

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

7 The four prior published versions ofthe List ofDesignated Methods were dated June 6, 2012, October 12,2011, April!, 2011, and Febmary 1, 2011.16

check the TTN-AMTIC website for any updates to the list or USEPA methods designations that may exist only in the form ofa FederalRegisternotice, and eitherupdate the version ofthe List ofDesignated Methods incorporated byreference or incorporate byreferenceFederalRegister 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 an unavoidable 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.
Refet·ences to Methods in the Text ofthe NAAQS. 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.P.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), 50.1O(a), 50.11 (a) and (d)(2), 50.13(a)(l) and (a)(2), 50.15(a), 50.16(a)(l) and (a)(2), and 50.17(c). OneNAAQS omits this language, even though the use ofUSEPA-designatedmethods is required. See 40 C.P.R. 50.12(a) (2102) (lead).
The Illinois NAAQS mles will specifyuse ofmethods "designatedbyUSEPA and listed inList 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)(l)(A), and (b)(l)(B). USEPA alone has authorityto designate monitoring methods. See 40 C.P.R. 53.8(a), 53.1l(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 countetparts. Standardization ofTerms: FRMs, FEMs, and List ofDesignated Methods. In the 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 ofthe USEPA regulations: (I) theNAAQS mles themselves; and (2) the mles pertaining to methods designations. As a result, the Illinois NAAQS mles define the standardized tem1s "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 "reference method," in conesponding 40 C.P.R. 50.1(±), and "federal reference method" in40 C.P.R. 53.1, which is in theprovisions for approval ofthese methods. TheBoard has further used the defmed abbreviation "PRM" for this term throughout the substantive provisions ofthe NAAQS-derived regulations. This is without regard to whether the method is codified as an17
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" in40 C.F.R. 53.1. The Boardhas used the defined abbreviation "FEM" to refer to the equivalent methods.
The following discussions use the abbreviations "FRM" and "FEM"to refer to 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 inconsistentusage in the federal language, but makes no attempt to reconcile the language. Therevisions to the federal text that the Board has made are limited to standardizations ofte1ms. The Board intends that the Illinois NAAQS mles have the same substantive effect as do the federal NAAQS upon which they are based.
Most oftheNAAQS provisions describe the permissible FRMs in the following terms: "areference method based on [the reference method cited in the] appendix

... and designated [by USEPA]." See 40 C.F.R. 50.6(c)(l) (PM 10), 50.7(a)(1) (PM25), 50.8(b)(1) (carbon monoxide), 50.9(a) (ozone), 50.1O(a) (ozone), 50.11(d)(1) (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, but none 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 PM2.5), 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 te1m "anFRMbased on [the reference method cited in] appendix

... and designated byUSEPA."
The Board has followed the federal language very closely inthe con·esponding Illinois NAAQS provisions, with three shifts in language discussed inthe innnediately foregoing paragraphs: (1) the Board standardized usage ofthe defined term "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 corresponding Illinois NAAQS use the phrasing "anFRMbased on appendix

... and designated byUSEPA and listed in List of Designated Methods, incorporatedbyreference in Section 243.108." See 35 Ill. Adm. Code 243.120(a)(3)(A), (b)(1)(A), and (c)(1)(A) (PM 10 and PM25); 243.123(b)(l) (carbon monoxide); 243.124(d)(l) (nitrogen oxides); and 243.125(a)(1), (b)(l), and (c)(1) (ozone).
The Board notes the potential for ambiguities in the federal language. The first ambiguity concerns whether some FRMs are directly available for use when USEPA has specifieduse 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 inthe List of Designated Methods.18

The NAAQS for carbon monoxide, ozone, nitrogen oxides, PM10, and PM25 require use ofan FRM "based on" an associated appendix to 40 C.P.R. 50. See 40 C.P.R. 50.6(c)(1) (2012) ("based on appendix 

### J" for PM10); 40 C.P.R. 50.7(a)(l) and 50.13(a)(1) (2012) ("based on appendix L" for PM2.5); 40 C.P.R. 50.8(b)(l) (2012) ("based on appendix C" for carbon monoxide); 40 C.P.R. 50.9(a), 50.10(a), and 50.15(a) (2012) ("based on appendix D" for ozone); 40 C.P.R. 50.11 (d)(!) (20 12) ("based on appendix F" for nitrogen oxides). Fmther, the List of Designated Methods does not include listings for Appendices C, D, F, 

### J, and L to 40 C.P.R. 50, relative to carbon monoxide, ozone, nitrogen oxides, PM 10, and PM25 , respectively. The general rules relative to FRM designations for PM 10, 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.P.R. 53.2(a)(2), (a)(3), and (b) (2012).
The NAAQS for sulfur oxides add to the potential for ambiguity. The three 1971 NAAQS for sulfur oxides (the 1971 primary annual average NAAQS for sulfur oxides, the 1971 primary 24-hourNAAQS for sulfur oxides, and the 1971 secondary three-hour NAAQS for sulfur oxides) use a second term to refer to the permissible FRM: "the reference method described 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 otherthan 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 specifythat an automated FRM for sulfur oxides "mustuse the measurement principle and calibrationprocedure specified in" Appendix A-1 to 40 C.P.R. 53.2(b) (2012). Consistent withuse 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.
On the other hand, the 2010 primary one-hourNAAQS for sulfur oxides uses the term "anFRMbased on appendix [A-2] orA-1." See 40 C.P.R. 50.17(c) (2012). This language is that used for theNAAQS for which no codified FRM is included inthe List ofDesignated methods.
The NAAQS for lead are also unique cases that enhance the potential for ambiguity. The leadNAAQS require an FRM "based on appendix G." See 40 C.P.R. 50.12(a) and 50.16(a)(l) (2012). The only FRMincluded in the List ofDesignated Methods is Appendix G. List of Designated Methods, at 42. Fmther, 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. Further, the Board observes that only two ofthe codified FRMs are included in List ofDesignated Methods.19

From apractical 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 mles, the Board cannot mitigate any potential for ambiguity. 

### Non-Codified FEMs. The third type ofUSEPA-designated method is an FEM. All of the FEMs are non-codified. USEPA refers to them all (often conjunctively with FRMs) with unifmm language: "an equivalent method designated in accordance with part 53 ofthis chapter." See 40 C.F.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 onthis language: (I) the NAAQS for lead omits "designated in accordance withpart 53 ofthe chapter" (see 40 C.F.R. 50.12(a) (2012)); and (2) the 2010 NAAQS for sulfur oxides capitalizes "Federal Equivalent Method" and adds "(FEM)" (see 40 C.F.R. 50.17(c) (2012)). The List ofDesignated Methods includes all ofthe FEMs. See List of Designated Methods, at 4-9 (11 for PM 10), 10-15 (17 for PM2.5), 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). Onlytwo federal NAAQS do not refer to the use ofan FEM. These are the 1997 prima1y and secondary one-hour and eight-hourNAAQS for ozone. Instead, these NAAQS recite only the use ofan FRM. See 40 C.F.R. 50.9(a) and 50.10(a) (2012). The Board could fmd no explanationwhy these standards do not refer to FEMs. See 62 Fed. Reg. 38856 (July 18, 1997) (adopting the 1997 standards). Fmther, the List ofDesignated Methods includes 23 FEMs for ozone. See List ofDesignated Methods at 25-30.
The Board has unifmmly 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 primary 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)(l), and (c)(l); and 243.126(a)(l) and (b)(l)(A) (NAAQS for PM 10, PM2
.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).
On the otherhand, the Boardhas not tried to reconcile the potential inconsistency with regard to the 1997 ozone standards. The Board has added no references to FEMs relative to those two NAAQS. See 35 Ill. Adm. Code 243.125(a)(l) and (b)(l).
TheDifference Between FRMs and FEMs. From the practical perspective ofuse, the Board sees no difference between an FRM (whether codified or non-codified) and an FEM. The federal NAAQS authorize the use ofeither type ofmethod. Still, there is a qualitative difference between the two types ofmethods. USEPA recited as follows withregard to methods for PM2.5:20
[R]eference methods

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

... [critetia 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

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

... [criteria pollutant] measurements comparable to reference measurements under a variety oftypical monitming conditions. 62 Fed. Reg. 38764,65 (July 18, 1997).
The Board observes that the federal rules divide FEMs for PM25 into three classes: Class I, Class II, and Class III. The distinctions are based onthe analyzer used. See 40 C.F.R. 53.1 (2012) (definitions of"Class I equivalent method," "Class II equivalent method," and "Class III equivalent method"). The performance characteristics and designationprocedures for each class differs. See 40 C.F.R. 53.3(a)(2) and (a)(3) (2012); table C-4 to subpa1t C of40 C.F.R. 53 (2012). USEPA explained that the classes are intended "[t]o minimize the number and extent of performance tests to which candidate equivalent methods are subjected

...." 62 Fed. Reg. 38764, 66 (July 18, 1997). Since the classes ofFEMs do notrelate 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 detetmine compliance with the NAAQS. All ofthese inte1pretations are embodied in an appendix to 40 C.F.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.F.R. 50 "to determine when the expected number ofdays per calendar" is below the regulatorythreshold level. See 40 C.F.R. 50.9(a) (2012); Appendix H to 40 C.F.R. 50 (2012) (introductory paragraph). Appendix I: The 1997 primary and secondary eight-hourNAAQS for ozone requires determination ofcompliance using the "data handling conventions and computations" ofAppendix I to 40 C.F.R. 50. See 40 C.F.R. 50.10(b) (2012); Appendix I to 40 C.F.R. 50 (2012) (introductoryparagraph). Appendix K: The 1987 primary and secondary 24-hourNAAOS for PM 10 requires determination ofcomplianceusing the "computations" ofAppendix K to 40 C.F.R. 50. See 40 C.F.R. 50.6(c)(l) (2012); Appendix K to 40 C.F.R. 50 (2012) (introductory paragraph). AppendixN: The 1997 and 2006 primary and secondary annual average and 24-hourNAAQS for PMz 5 (fourNAAQS) require determination ofcomplianceusing the "data handling conventions and computations" ofAppendix N to 40 C.F.R. 50. See 40 C.F.R. 50.7(b) and 50.!3(b) (2012); Appendix N to 40 C.F.R. 50 (2012) (introductory paragraph).21
Appendix P: The 2008 primary and secondary eight-hourNAAQS for ozonerequires determination ofcompliance using the "data handling conventions and computations" ofAppendix P to 40 C.F.R. 50. See 40 C.P.R. 50.15(b) (2012); Appendix P to 40 C.P.R. 50 (2012) (introductoryparagraph). Appendix R: The 2008 primary one-hourNAAQS 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 mimary 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. 50.11(e) and (f) (2012); Appendix S to 40 C.P.R. 50 (2012) (introductory paragraph). Appendix T: The 2010 primary one-hourNAAQS for sulfur oxides requires detennination of compliance using the "datahandling 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) (introductory paragraph).
Some ofthe oldest existingNAAQS do not require use ofinterpretations, including the following:
The 1971 primary annual averageNAAQS 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 secondarythree-hourNAAQS for sulfur oxides (see 40 C.P.R. 50.5 (2012)); The 1971 primary eight-hourNAAQS for carbon monoxide (see 40 C.P.R. 50.8 (2012)); The 1971 primary one-hourNAAQS for carbon monoxide (see 40 C.P.R. 50.8 (2012)); The 1971 secondary annual averageNAAQS for nitrogen oxides (see 40 C.P.R. 50.11 (2012)); and The 1978 primary and secondary qua1ierly average NAAQS for lead (see 40 C.P.R. 50.12 (2012)).
The Special CaseFRMs ofAppendices B. 

### 0, and 

### 0. Three codified FRMs are not directly relied onby anyNAAQS. The Boardhas 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: FRM(or Total SuspendedParticulate Matter. An old NAAQS for particulate matter (PM) formerly relied onAppendix B to 40 C.P.R. 50. See 40 C.F.R50.6 (1983). USEPAretained 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 PMw supplanted Appendix B for PM. USEPA did so because Appendix B is substantively referenced in Appendix G to 40 C.P.R. 50, for the purposes ofthe leadNAAQS. See 52 Fed. Reg. 24634, 48 (July 1, 1987).22

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 Board has retained the incorporation byreference to Appendix Bin 35 III. Adm. Code 243.108, noting the reference to this document inAppendix G to 40 C.P.R. 50. Appendix

### 0: FRM(or Coarse ParticulateMatter 

### (PM 10

_

2

_

5 

### 4, USEPA once proposed, yet declined to adopt aNAAQS for coarse particulate matter (PM10
.25). See 71 Fed. Reg. 61144, 94 (Oct. I7, 2006); 71 Fed. Reg. 2620, 98 (Jan. I7, 2006) (proposing a 24-hour standard of70 f1g/m3 as 40 C.P.R. 50.13(a)(2)(i)). USEPA, however, adopted the proposed FRM for PM10
.2
.5 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. I7, 2006) (accompanying amendments to 40 C.P.R. 53 and 58). USEPA explained as follows:
An official FRMwill be an impmiant element in facilitating consistent research on PM10-2. 5 air quality and health effects and in promoting the conunercial development ofFEMs. In a separate final rule

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

_ 25 monitors as pm1 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, USEPArequired all states to establish and operate at least oneNCore 8 monitoring site. USEPA provided that Illinois would need to establish and operate one ortwo additional sites. See Appendix D to 40 C.P.R. 58 (2012),**at~** 3(a); 71 Fed. Reg. 61236, 39 (Oct. 17, 2006). Monitoring for PM10
.2 .s is required at eachNCore site. See 40 C.P.R. 58.12(±)(1) (2012); Appendix D to 40 C.P.R. 58 (2012),**at~** 3(b); see also 40 C.P.R. 58.1 (2012) (definition of "NCore"). Further, Appendix Q to 40 C.F.R. 50 relies on Appendix 

### 0 for description ofthe required sampler, sampling period, measurement procedures, etc. See Appendix Q to 40 C.P.R. 50 (2012),**at~~** 1.2 and 3.1. Appendix Q is considered in the following segment ofthis discussion, immediately below. Thus, the NCore monitoring provisions sites and Appendix Q to 40 C.P.R. 50 rely on Appendix 

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

### 0 is notpart ofan active NAAQS. Forthis reason, the Board has retained the incorporationbyreference to Appendix 

### 0 in 35 Ill. Adm. Code 243.108, noting the reference to this document inAppendix Q to 40 C.P.R. 50. The Board has also noted thatthis method is "foruse in federally required monitoring bythe NCore systempursuant to 40 CPR58."

8 Defined as the "Nationa! Core multipollutant monitoring stations" that monitor PM25, speciated PM2 .s PM10
.2 .s, ozone, sulfur dioxide, carbon monoxide, nitrogen oxides, lead, and basic weather data. 40 C.P.R. 58.1 (2012).

### 23
Appendix 0: FRMfOr Leadin ParticulateMatter (PM 10

2. 

### USEPA once proposed revising the NAAQS for lead, which is lead in ultra-coarse particulate matter (Pb-PM) to lead in coarse pmticulate matter (Pb-PM 10). 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-PM 10 

### 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 secondmy three-month average NAAQS for lead as Appendix R to 40 C.P.R. 50. Appendix R refers to the FRM for Pb-PM 10 

### in Appendix Q. See 

### Appendix R to 40 C.P.R. 50 (2012), at 'i[l(a); 73 Fed. Reg. at 67019-21.
The substantive reliance on Appendix Q in Appendix R to 40 C.F.R. 50 warrants inclusion ofAppendix Q in the Illinois NAAQS mles. Appendix Q provides an alternative monitoring methodology for the 2008 NAAQS for lead. For this reason, the Board has retained the incorporation by reference to Appendix Q in 35 Ill. 

### Adm. Code 243.108, noting the reference to this document in Appendix R to 40 C.P.R. 50.
SummarvTabulation oftheNAAQS and SupportingAppendices. The following tabulation lists all ofthe federal NAAQS, the codified FRM and any "interpretation" associated with each. NAAQS (Or Sulfur Oxides: 

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

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

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

### Adm. Code 243.122(a)(3) Interpretation specified: None NAAQS: 1971 secondarythree-hour NAAQS for sulfur oxides Citations: 40 C.P.R. 50.5(a)/35 Ill. 

### Adm. Code 243.122(b)(l) FRM specified: Appendix A-2 to 40 C.P.R. 50 Citations: 40 C.P.R. 50.5(b)/35 Ill. 

### Adm. Code 243.122(b)(2) Interpretation specified: None NAAQS: 2010 primary one-hourNAAQS for sulfur oxides Citations: 40 C.P.R. 50.17(a)/35 Ill. Adm. Code 243.122(c)(l) FRM specified: Appendix A-1 or A-2 to 40 C.P.R. 50 Citations: 40 C.P.R. 50.17(c)/35 Ill. 

### Adm. Code 243.122(c)(3)

### 24
Interpretation specified: Appendix T to 40 C.P.R. 50 Federal citation: 40 C.P.R. 50.17(b)/35 Ill. 

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


### NAAOSfor PM1

### oandPM, 5 : 

### NAAQS: 1987 primary and secondary 24-hour NAAQS for PM 10 

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

### Adm. Code 243.120(a)(l) FRM specified: Appendix J 

### to 40 C.P.R. 50 Citations: 40 C.P.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.P.R. 50.6(a)/35 Ill. 

### Adm. Code 243.120(a)(l) NAAQS: 1997 primary and secondary annual average NAAQS for PM, 5 

### Citations: 40 C.P.R. 50.7(a)/35 Ill. Adm. Code 243.120(b)(l) FRM specified: Appendix L to 40 C.P.R. 50 Citations: 40 C.P.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) FRM specified: Appendix L to 40 C.P.R. 50 Citations: 40 C.P.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: 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 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(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) FRM specified: Appendix L to 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(c)/35 Ill. 

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


### NAAOSfor Carbon Monoxide: NAAQS: 1971 primary eight-hourNAAQS for carbon monoxide Citations: 40 C.P.R. 50.8(a)(l)/35 Ill. Adm. Code 243.123(a)(l) FRM 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)

### 25
Interpretation specified: None NAAQS: 1971 primary one-hour NAAOS for carbon monoxide Citations: 40 C.F.R. 50.8(a)(2)/35 Ill. Adm. Code 243.123(a)(2) FRM specified: Appendix C to 40 C.F.R. 50 Citations: 40 C.F.R. 50.8(b)(l)/35 Ill. Adm. Code 243.123(b)(l) Interpretation specified: None
NAAOS (Or Ozone: 

### NAAQS: 1997 PJimary and secondmy one-hourNAAQS for ozone Citations: 40 C.F.R. 50.9(a)/35 Ill. 

### Adm. Code 243.125(a)(l) FRM specified: Appendix D to 40 C.F.R. 50 Citations: 40 C.F.R. 50.9(a)/35 Ill. Adm. Code 243.125(a)(l) Interpretation specified: Appendix H to 40 C.F.R. 50 Citations: 40 C.F.R. 50.9(a)/35 Ill. Adm. Code 243.125(a)(l) NAAQS: 1997 primary and secondary eight-hour NAAQS for ozone Federal citation: 40 C.F.R. 50.10(a)/35 Ill. Adm. Code 243.125(b)(l) FRM specified: Appendix D to 40 C.F.R. 50 Citations: 40 C.F.R. 50.10(a)/35 Ill. Adm. Code 243.125(b)(l) Interpretation specified: Appendix I to 40 C.F.R. 50 Citations: 40 C.F.R. 50.10(b)/35 Ill. 

### Adm. Code 243.125(b)(2) NAAQS: 2008 primary and secondary eight-hour NAAQS for ozone Federal citation: 40 C.F.R. 50.15(a)/35 Ill. 

### Adm. Code 243.125(c)(l) FRM specified: Appendix D to 40 C.F.R. 50 Citations: 40 C.F.R. 50.15(a)/35 Ill. 

### Adm. Code 243.125(c)(l) Interpretation specified: Appendix P to 40 C.F.R. 50 Citations: 40 C.F.R. 50.15(b)/35 Ill. 

### Adm. Code 243.125(c)(2)
NAAOS (OrNitrogen Oxides: 

### NAAQS: 1971 primary annual average NAAQS for nitrogen oxides Citations: 40 C.F.R. 50.11(a)/35 Ill. 

### Adm. Code 243.124(a) FRM specified: Appendix F to 40 C.F.R. 50 Citations: 40 C.F.R. 50.ll(d)(l)/35 Ill. Adm. Code 243.124(d)(l) Intetpretation specified: Appendix S to 40 C.F.R. 50 Citations: 40 C.F.R. 50.ll(e)/35 Ill. 

### Adm. Code 243.124(e) NAAQS: 2010 primary one-hourNAAOS for nitrogen oxides Citations: 40 C.F.R. 50.ll(b)/35 Ill. 

### Adm. Code 243.124(b) FRM specified: Appendix F to 40 C.F.R. 50 Citations: 40 C.F.R. 50.ll(d)(l)/35 Ill. Adm. Code 243.124(d)(l) Interpretation specified: Appendix S to 40 C.F.R. 50 Citations: 40 C.F.R. 50.11(£)/35 Ill. 

### Adm. Code 243.124(f)

### 26

NAAQS: 1971 secondary annual average NAAQS for nitrogen oxides Citations: 40 C.F.R. 50.11(c)/35 Ill. 

### Adm. Code 243.124(c) FRM specified: Appendix F to 40 C.F.R. 50 Citations: 40 C.F.R. 50.11(d)(l)/35 lll. 

### Adm. Code 243.124(d)(l) Interpretation specified: None 

### NAAQS (orLead: NAAQS: 1978 primary and secondary gumterly average NAAQS for lead Citations: 40 C.F.R. 50.12(a)/35 Ill. 

### Adm. Code 243.126(a)(l) FRM specified: Appendix G to 40 C.F.R. 50 (relying on Appendix B) Citations: 40 C.F.R. 50.12(a)/35 Ill. 

### Adm. Code 243.126(a)(l) Interpretation specified: None NAAQS: 2008 primary and secondarytlu·ee-month average NAAQS for lead Citations: 40 C.F.R. 50.16(a)/35 Ill. 

### Adm. Code 243.126(b) FRM specified: Appendix G to 40 C.F.R. 50 (relying onAppendix B) Citations: 40 C.F.R. 50.16(a)(1)/35 Ill. Adm. Code 243.126(b)(1)(A) Interpretation specified: Appendix R to 40 C.F.R. 50 (relying onAppendix Q, which relies on Appendix 0) 

### Citations: 40 C.F.R. 50.16(b)/35 Ill. 

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

### Non-NAAQSRequiredMonitoring: Required by: NCore monitoring for PM 10•2.s 

### Citation: 40 C.F.R. 58.12(±)(1) FRM specified: Appendix 0 

### to 40 C.F.R. 50 Citation: Appendix D to 40 C.F.R. 58 (2012),**at~** 

### 3(b)
Summarvre Incorporation oftheFRMs, FEMs, and Interpretations. Based on the foregoing, the Board has incorporated the three types ofUSEPA-designated monitming methods in the following ways. All ofthe incorporations have been done by incorporations by reference, as described. 

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

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

### Non-Codified FRMs. The Board has incorporated byreference the listing ofall ofthe non-codified FRMs, but not the FRMs 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 by incorporationbyreference to the List of27
Designated Methods. See 35 Ill. Adm. Code 243.108. Atpresent, there are 88 non-codified FRMs included inthe List ofDesignated Methods: 16 for PM10, 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 FEMs, all ofwhich are non-codified. These methods are identified inthe List ofDesignated Methods, inthe samemanner as are the non-codified FRMs, with the actual method not set forth in full. As for the non-codified FRMs, the Board includes the FEMs inthe Illinois regulations by incorporationbyreference to the List ofDesignated Methods. See 35 Ill. Adm. Code 243.108. Atpresent, there are 127 FEMs included in the List ofDesignated Methods: II for PM10, 17 for PM25 , 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 incmporated byreference all ofthe intetpretations relative to the various NAAQS, all ofwhich are codified as appendices to 40 C.P.R. 50. As for the codified FRMs, the Board includes the intetpretations inthe lllinois regulations by incorporationbyreference ofthe various appendices. See 35 Ill. Adm. Code 243.108. At present, there are eight intetpretations included in the appendices: Appendices 

### H, I, K, N, P, R, S, and T to 40 C.P.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.P.R. 50. As for the codified FRMs that directly suppmitheNAAQS, the Board includes the FRMs in the Illinois regulations by incorporationbyreference ofthe various appendices. See 35 Ill. Adm. Code 243.108. Atpresent, there are three special-caseFRMs that do not directly support anNAAQS included inthe appendices: Appendices B, 

### 0, and Q to 40 C.P.R. 50.


### Omission ofAncillarv Federal Regulations in 40 C.P.R. 53, 58, 

### and 81
USEPA uses the procedures of40 C.P.R. 53 to makeFRM and FEM designations. See 40 C.P.R. 53.2, 53.3, and 53.8 (2012). Further, USEPA uses those mles to remove methods from the List ofDesignatedMethods. See 40 C.P.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.P.R. 53. While the methods approved byUSEPApursuantto 40 C.P.R. 53 are vital to implementing the standards, onlythe methods themselves are specified within the text oftheNAAQS. Since no NAAQS directly depends on anyprovision of40 C.P.R. 53, the Boardhas entirely omitted the federal methods designations provisions from the Illinois NAAQS regulations.
The requirements of40 C.P.R. 58 prescribe the requirements for establishing, operating, and maintaining monitoring networks and monitoring plans. See 40 C.P.R. 58.2 (2012). While these requirements are essential to implementation oftheNAAQS, none oftheNAAQS tetms depend on any provision ofthe monitoring network mles. Further, as discussed above, the Board believes that 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 mles. See 40 C.P.R. 58 (2012) (authoritynote); 415 ILCS 5/IO(H), as added byP.A. 97-945, eff. Aug. 10,2012. For28

these reasons, the Board entirely omitted the federal ambient air quality monitoring system requirements from the IllinoisNAAQS regulations.
The federal definitions ofair quality monitoring areas and attainment designations of these areas are codified in 40 C.F.R. 81. In particular, these federal rules defme the boundaries 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-]anesville-Beloit Interstate), 81.98 (Burlington-Keokuk Interstate), 81.10I (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 codifY USEPA's attainment designations for these designated areas. See 81.314 (2012). Many transitional provisions inthe federal NAAQS make applicability ofNAAQS depend on the attainment status ofthe various 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 applicabilityoftheseNAAQS 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 ancillary rules inthe Illinois NAAQS rule.
The Board acknowledges the need to monitor future amendments to 40 C.F.R. 81 to determine the applicability ofNAAQS. The Board has used 40 C.F.R. 81 to determine the applicability ofNAAQS for two criteria contaminants: the 1971 primary 24-hourNAAQS for sulfur oxides and the 1979 primary calendar quarterly average NAAQS for lead. The Board foresees two possible modes for removal ofobsoleteNAAQS from the Illinois rules. The first is USEPA removal ofthe NAAQS from 40 C.F.R. 50. The second is when the NAAQS no longer applies to any area inthis 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 the NAAQS codified in 40 C.F.R. 50.
Revisions to USEPA Definitions/Definitions Added
The Boardhas incmporated 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 clarity ofthe rules. The following paragraphs broadly describe the revisions to the federal definitions. Table 1, details the revisions to the federal language.
Shifted Meanings and Revisions to the Preamble. The following bulleted segments describe the changed meanings for terms, the definitions added as a result, and the revisions to the preamble statement ofthe definitions provision.

### 29

• The Board changed the meaning ofthe tenn "Act" to mean the Environmental Protection Act (415 ILCS 5 (2012)), rather than the federal Clean Air Act (42 U.S.C. §§ 7401 etseq. (2011 )). This change required adding a definition of"CleanAir Act," together with a defined abbreviation "CAA."9
The Board shifted the meaning ofthe term "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."
The Board added an affirmative statement ofapplicability ofthe definitions in the preamble. No such statement exists in 40 C.P.R. 50.1. Rather, the corresponding federal preamble states that the definition ofa te1m given bythe Clean Air Act applies to terms not defmed in 40 C.P.R. 50.1.
The Boardretained the word "Act" in the language drawn from the federal preamble statement in40 C.P.R. 50.1. The above-described shifted definition of"Act" would change the focus from definitions in the 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 Board has replaced "Act" with "CAA'' inthis statement. The Board further added areference to the definitions of35 

### TIL 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 purposes for the changes are two-fold: (!)to standardize use ofthe term and confonnthe term to its use in the text; and (2) to enhance the clarity ofthe term. The following bulleted points describe the changed terms: The Board changed "exceedance with respect 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 "PEM" for consistent use inthe text ofthe rules for the reasons previously explained in this opinion and order.
TheBoard changed "referencemethod" to "federal reference method" and added the defined abbreviation "PRM" for consistentuse inthe text ofthe rules for the reasons previously explained inthis opinion and order.
Added Defined Terms. The Board has added a limited number ofdefined terms. The purposes for the additions are two-fold: (1) to standardize use ofthe te1m in the text ofthe rules;

9 Adding this defmition may not have been necessary, as the term "CAA" is used only inthe "Scope" provision of35 Ill. Adm. Code 243.102(a) (derived from 40 C.P.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.30

and (2) to enhance the clarity ofthe text. The following bulleted points desctibe the added defined te1ms:
The Board added a defmition ofthe term "micrograms percubic meter" and the defined abbreviation "f1g/m3" to enable the use ofthe defined abbreviation in 35 Ill. Adm. Code 243.124(c) and 243.126(b)(l) and (b)(2) (corresponding with 40 C.P.R. 50.6(a), 50.7(a), and 50.9(a) (2012)), based onthe definition ofthe abbreviation in 40 C.P.R. 50.6(a) and 50.7(a) (2012).
The Board added a definition ofthe term "milligramspercubic meter" and the defined abbreviation "mg/m3" to enable use ofthe defined abbreviation in 35 Ill. Adm. Code 243.124(a)(l) and (a)(2) (based on40 C.P.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 definition is based onthe definition in "Tetms ofEnvironment: Glossary, Abbreviations, and Acronyms" (December 1997), EPA 175-B-97-001, at 30.
The Board added a definition ofthe term "parts perbillion" and the defmed 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.P.R. 50.15(a) (2012)).

• The Board added a definition ofthe term "patispermillion" and the defined abbreviation "ppm"to enable use ofthe defmed abbreviation in 35 Ill. Adm. Code 243.122(a)(l), (a)(2), (b)(!), 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.P.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.ll(g); 50.14(c); and 50.15(b) (2012)), based onthe definition ofthe abbreviation in 40 C.P.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.P.R. 50.6(c), for the purposes of35 Ill. Adm. Code 243.120(a) (conesponding with 40 C.P.R. 50.6 (2012)).
The Board added a definition ofthe term "PM2
.5,"based onthe parenthetical definition in 40 C.P.R. 50.7(a), for the purposes of35 Ill. Adm. Code 243.120(b) and (c) (corresponding with40 C.P.R. 50.7 and 50.13 (2012)).
Omitted Defined Terms. The Boardhas omitted two ofthe federally defmed te1ms. The purposes for the omissions are (1) to exclude a te1m thathas no present operative effect in Illinois 

### (see 415 ILCS 5/7.2(a)(l) (2012)); and (2) to omit a tetm that has been substituted in the text ofthe mles with another term. The following bulleted paragraphs describe the definitions omitted.31

The Board omitted the federal definition of"lndiancountry" from 40 C.F.R. 50.2(i), since no such area that falls within this definition exists in illinois.
The Board omitted the definition of"Administrator," since the tenn "USEPA" is substituted for this term throughout the text ofthe rules. See 35 Ill. Adm. Code 243.102 (defmition of"exceptional event"; corresponding with 40 C.F.R. 50.1(j)) and 243.102(b) (corresponding with 40 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 current direct counterparts inthe federal rules:

• Preamble (35 Ill. Adm. Code 243.102), which the Board has replaced with the statement ofscope from 40 C.F.R. 50.2. Therecitations ofthe existing preamble statement are similar in nature to those ofthe federal scope statement. Replacing the Statepreamble statement with the federal statement ofscope minimizes the potential for conflicts betweenthe Illinois and federal NAAQS requirements.

• Nondegradation (35 Ill. Adm. Code 243.104), which the Boardhasremoved in its entirety. The federal rules include no direct counterpart to this requirement. Section 110 ofthe federal CleanAirAct (42 U.S.C. § 7410 (2011)), however, includes a requirement that a SIP must not interfere withrequirements to prevent significant deterioration (PSD). 10 See 42 U.S.C. 

### § 7410(a)(2)(D)(i)(II) and (a)(2)(J) (2011). Monitoring (35 Ill. Adm. Code 243.106), which the Boardhas removed inits entirety. The federal NAAQS rules include no direct counterpart to this requirement. Rather, 40 C.F.R. 58 sets forth the detailed requirements for airmonitoring networks. As is discussed above, the Board has not included requirements from 40 C.F.R. 58 inthis proceeding. TheBoard does not perceive those requirements to bepart ofthe NAAQS, despite the important role the air monitoring network rules playin ensuring compliance with theNAAQS.

• Rule into SectionTable and Sectioninto Rule Table (Appendices A and B to 35 Ill. Adm. Code 243), which the Board has removed intheir entirety. Thosetables correlated the numbers ofthe original Illinois airpollution control rules relating to ambient air quality with the numbers ofrules in the codified version, which arose in 1983. See 7 lll. 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 which the Boardreplaced the fmmerpreamble statement, as described i1mnediately above.

10 Part C ofthe CleanAir Act includes the federal PSD requirements. See 42 U.S.C. 

### § 7470-92 (2011).32

Air Quality Monitoring Data Influenced byExceptional Events (35 Ill. Adm. Code 243.105 and Table A to 35 Ill. Adm. Code 243), which the Board added to correspond with 40 C.F.R. 50.14 (2012) ("Treatment ofair qualitymonitoring data influenced by exceptional events"). This provision sets forth the procedure for USEPA approval of excluding monitming data that resulted froin an exceptional event. Under the procedure, a state flags such data and requests that USEPA exclude that data. Upon an affnmative USEPA detennination that the data were the result ofan exceptional event, USEPA will exclude that data from the detetmination ofcompliance. See 40 C.F.R. 50.14 (2012). The procedure also includes a requirement for public notification ofan event that is expected to result in exceedance ofanyNAAQS. See 40 C.F.R. 50.14(c)(l) (2012). The term "exceptional event" is defmed in40 C.F.R. 50.l(j) as follows: (j) Exceptional event means an event that affects air quality, is not reasonably controllable orpreventable, is an event causedbyhuman activity that is unlikely to recur at a particular location or a natural event, and is determined by [USEPA] in accordance with 40 CFR 50.14 to be an exceptional event. It does not include stagnation ofairmasses or meteorological inversions, a meteorological event involving high temperatures or lack ofprecipitation, or air pollution relating to source noncompliance. 40 C.F.R. 50.l(j) (2012); see (35 Ill. Adm. Code 243.101); see also 40 C.F.R. 50.1(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 Ill. Adm. Code 243.105(b)(1), (b)(2), and (b)(3). The Board further omitted expired federal provisions. See 35 Ill. Adm. Code 243.105(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 Ill. Adm. Code 243. Inclusion ofthe tabular matetial at corresponding with 35 Ill. Adm. Code 243.105(c)(2)(F) would have required a two-inch left indent and extensive reorganization ofthe material. See 1 Ill. Adm. Code 100.340; Illinois Secretary ofState, Index Department, Administrative Code Division, StyleManual, IllinoisAdministrative Code andIllinois Register (June 2004). 11
The Boardfound it necessary to make minor revisions to the federal tabular material. First, the Board omitted federal footnotes "a" and "b" relating to federal effective dates from the text, since theywould serve no function in the Illinois text. Second, the Board conectedthe 2010 one-hourNAAQS for nitrogen oxides from "80-100 PPB, final level TBD" to "100 ppb"

11 Available online at www.cyberdriveillinois.com/publications.33

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 Table A to 35 Ill. 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 ormore 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 the NAAQS 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 ofparticulates in the ambient air. USEPA then used what has now been called "PM 10," which are the patiiculates 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 "PM2.5," which is also called "finepatiiculates": those having an aerodynamic diameter of2.5 microns orless. See 40 C.F.R. 50.7(a) (2012). The following table summarizes the development ofthe NAAQS for particulate matter (indicating currently codified standards in bold):
1971 Primary Annual Average NAAQS for Total Suspended Particulates CTSP) (Removed) Standard: Citation: 75 I-tglm 3 annual geometric mean 40 C.F.R. 50.6(a) (1986) (originally42 C.F.R. 410.6(a) (1971)) April30, 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 Primary 24-HourNAAQS for Total Suspended Patiiculates (TSP) (Removed) Standard: 260 I-tg/m3 not to be exceeded more than once in a year

12 This is an apparent error in fmal 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 20I0 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).

13 USEPA adopted primary 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).34

Citation: 40 C.F.R. 50.6(b) (1986) (originally 42 C.F.R. 410.6(b) (1971)) April30, 1971 (36 Fed. Reg. 8186): Original adoption. November 25, 1971 (36 Fed. Reg. 22384): Recodified without substantive reVlSlOn. July I, 1987 (52 Fed. Reg. 24634): Removed.
1971 Secondary Annual Average NAAQS for Total Suspended Particulates (TSP) (Removed) Standard:
Citation: 60**~g/m 3**  used for assessing implementation plans achieving the 1971 secondary 24-hour standard 40 C.F.R. 50.7(a) (1986) (originally 42 C.F.R. 410.7(a) (1971)) April30, 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 Secondary 24-HourNAAQS for Total Suspended Particulates (TSP) (Removed) Standard: !50**~g/m 3**  not to be exceeded more than once in a year Citation: 40 C.F.R. 50.7(b) (1986) (originally 42 C.F.R. 410.7(b) (1971)) April30, 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.
1987 Primarv and Secondarv 24-Hour NAAQS for PM10 (Current) Standard: !50

### ~g/m**3** not to be exceeded more than once per year, on athree-year average basis Citation: 40 C.F.R. 50.6(a) (2012) July 1, 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 SecondaryAnnual AverageNAAQS for PM 10 (Removed) Standard: 50**~g/m 3**  annual arithmetic mean on a three-year average basis

14 Not described inthis summary outline because USEPA subsequently removed the sunset provision. See 40 C.F.R. 50.6(d) (1998) (the removed sunset provision).

15 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), aif'd in partandrev'd inpartsub 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).

### 35

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): Sunsetprovision removed 17 

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

### (Removed) Standard: 50 J.Lg/m3 

### annual arithmetic mean, averaged overthree 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 Ptimary and Secondary 24-HourNAAQS for PM 10 

### (Removed)
Standard: !50j.Lg/m3 

### 99th percentile, averaged over three 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 Primary and Secondarv Annual Average NAAQS for PM25 (Current) 

### Standard: 15.0 J.Lg/m3

### arithmetic 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).
1997 Primary and Secondarv 24-Hour NAAQS for PMz..2 (Current) 

### Standard: 65 J.Lg/m398thpercentile, 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).
2006 Primarv and Secondary Annual Average NAAQS for PM2.5 (Current) 

### Standard: 15.0 J.Lgim3atithmetic mean, averaged overthree years Citation: 40 C.P.R. 50.13(a) (2012)
October 17, 2006 (71 Fed. Reg. 61144): Original adoption.

16 See supra 

### note 14.

17 See supra 

### note 15.36

2006 Primarv and Secondary 24-Hour NAAQS for PM, 5 (Current) Standard: 35

### ~g/m**3** 98th percentile, averaged over three years Citation: 40 C.F.R. 50.13(a) (2012)
October 17,2006 (71 Fed. Reg. 61144): Original adoption.
Five primary and secondaryNAAQS for particulate matter remain codified in three federal rules: 40 C.F.R. 50.6, 50.7, and 50.13. There remains one standard for PM 10 and four for PM2
.5• 18 The Board has codified these five standards in 35 Ill. Adm. Code 243.120. The Board proposes replacing this particulate matter provision with the text ofthe five federal NAAQS. Each ofthe federal particulate matter provisions appears in a separate subsection, one for each of the 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 p1imary and secondary 24-hourNAAQS for PM 10 1997 primary and secondary annual average NAAQS for 243.120(b) 40 c.F.R. 50.7 

### PMzs 1997 p1imary and secondary 24-hourNAAQS for PM2
.5 2006 primary and secondary annual average NAAQS for 243.120(c) 40 C.F.R. 50.13 PM2
.5 2006 primary 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 necessaryto incorporate them into the lllinois air regulations. Persons wishing to understand the substance ofa federal standard should review the FederalRegister notices bywhich USEPA has adopted, reviewed, and amended the various standards. Those notices are listed in the foregoing review ofthe federal standards for particulate matter. The Board has codified the federal NAAQS for pa1ticulate matter without substantive revision. All ofthe deviations from the literal text ofthe federal NAAQS are itemized in Table I. 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 sunset provision stated that the 1987 standards would not apply to an area designated non-attaimnent withthe 1987 standards once USEPA has established rules for non-attaimnent areas as required by

18 USEPA proposed and declined to adopt a standard for coarse pmticulate matter (PM 10.25). See the discussion that appears at page 20 ofthis opinion and order.37

section 172(e) ofthe CleanAir Act (42 U.S.C. § 7502(e) (2011). The sunsetprovision further stated that the 1987 standards would not apply to an area that had attained those standards after USEPA has approved a SIP for that area relative to the new 1997 standards. See 40 C.F.R. 50.6(d) (1998).
USEPA later removed the 1997 NAAQS for PM 10 and the sunsetprovision 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 inpartandrev'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 p1imary and secondary24-hourNAAQS for PM 10 continues to apply. 19 See 65 Fed. Reg. 80776, 77 (Dec. 22, 2000).
The Boardhas included the 1987 standard for PM 10 . The explanation thatthe Board appended to the 1987 standards explains Boardretention ofthe 1987 standards. TheBoardhas not included the 1997 NAAQS for PM 10 in the Illinois regulations.
The Board has retained the 1997 NAAQS for PM2.s because USEPA has done so. The 2006 primary and secondary annual averageNAAQS for PM2.s is nearlythe same as the 1997 annual average standard.20 On the otherhand, the 2006 primary and secondmy24-hourNAAQS for PMz.s is more stringent than the 1997 24-hour standard. Compare 40 C.F.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 PM2.5 mayhave continuing vitality for implementation ofvarious federal an1bient air quality rules. See 71 Fed. Reg. 61144, 49 (Oct. 17, 2006). The explanation appended to the 1997 NAAQS for PM2.s outlines USEP A's addition ofthe 2006 annual average and 24-hour NAAQS for PM2.s and Board retention ofthe 1997 standard. Section 243.122: Sulfur Oxides. USEPA has maintained prin1ary and secondary NAAQS for sulfur oxides since 1971. The following table summarizes the development ofthe NAAQS for sulfur oxides (indicating cunently codified standards in bold):
1971 Primary Annual Average NAAQS for Sulfur Oxides (as S02) (Subject to Sunset) Standard: Citation: 0.030 ppm annual arithmetic mean 40 C.F.R. 50.4(a) (2012) (originally 42 C.F.R. 410.4(a) (1971)) April30, 1971 (36 Fed. Reg. 8186): Original adoption as 80 J.lg/m3 (O.Q3 ppm). November 25, 1971 (36 Fed. Reg. 22369, 84): Recodified without substantive reviSIOn.

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

20 USEP A kept the numerical standard the same, but revised the monitoring and data handling conventions for determining compliance. See 71 Fed. Reg. 61144, 77, 210-11 (Oct. 17, 2006).38
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 apply to an area one year afterUSEPA designation ofthe attainment status ofthat area underthe 2010 primary one-hour standard, with exceptions.
1971 Primarv 24-Hour NAAQS for Sulfur Oxides (as S02) (Subject to Sunset) Standard: 0.14 ppm not to be exceeded more than once per year Citation: 40 C.P.R. 50.4(b) (2012) (otiginally42 C.P.R. 410.4(b) (1971)) April30, 1971 (36 Fed. Reg. 8186): Original adoption as 365 f.tg/m3 (0.14 ppm). November 25, 1971 (36 Fed. Reg. 22369, 84): Recodified without substantive reVISIOn. Apri121, 1993 (58 Fed. Reg. 21351): Retained without revision. May 22, 1996 (61 Fed. Reg. 25566): Immatetial change to 0.14 ppm (metric units removed). June 22,2010 (75 Fed. Reg. 35520): Sunset provision added: the standard does not applyto an area one year afterUSEPA designation ofthe attainment status ofthat area under the 2010 primary one-hour standard, with exceptions.
1971 Secondary Annual AverageNAAQS for Sulfur Oxides (as SO,) (Revoked) Standard: 60 [lglm3 (0.02 ppm) annual arithmetic mean Citation: 40 C.P.R. 50.5(a) (1972) (originally 42 C.P.R. 410.5(a) (1971)) Aptil30, 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 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.P.R. 410.5(b) (1971)) April 30, 1971 (36 Fed. Reg. 8186): Original adoption. November 25, 1971 (36 Fed. Reg. 22369, 84): Recodified without substantive revts!On. September 14, 1973 (36 Fed. Reg. 25678): Revoked.
1971 Secondary Three-Hour NAAQS for Sulfur Oxides (as S02) (Current) Standard: 0.5 ppm notto be exceeded more than once per year Citation: 40 C.P.R. 50.5 (2012) (originally42 C.P.R. 410.5(c) (1971), then40 C.P.R. 50.5(c) (1972))39
April 30, 1971 (36 Fed. Reg. 8186): Original adoption as 1300 J.!g/m3 (0.5 ppm). November 25, 1971 (36 Fed. Reg. 22369, 84): Recodified without substantive revrswn. 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 S02) (Current) Standard: 75 ppb 99thpercentile, 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 federal rules: 40 C.F.R. 50.4, 50.5, and 50.17. The Board has codified these four standards in 35 Ill. Adm. Code 243.122. The Board proposes replacing 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)(l) 40 C.F.R. 50.4(a) 1971 primary annual average NAAQS 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 primary one-hourNAAQS for sulfur oxides

As previously discussed, 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 of a federal standard should review the FederalRegisternotices bywhich USEPA has adopted, reviewed, and amended the vmious 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 I. The Board discusses here only one issue relative to the federal NAAQS for sulfur oxides: USEPA addition ofa sunset provision to the 1971 primary mual average and 24-hourNAAQS for sulfur oxides with adoption ofthe 2010 primaryNAAQS for sulfur oxides.
Sunset Clause (or the 1971 Primary24-HourNAAQS (or Sulfur Oxides. Upon adoption ofthe 2010 primary one-hourNAAQS for sulfur oxides, USEPA added the following sunset clause:40

The [1971 primaty annual average and 24-hour] standards [for sulfur oxides] set fmth inthis section will remain applicable to all areas notwithstanding the promulgation of[the 2010] 

## 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 fmth inthis section will no longer applyto an area one year after the effective date ofthe designation ofthat area, pursuant to section I07 ofthe Clean Air Act, for the [201 0] S02 NAAQS set fmth in§ 50.17; except that for areas designated nonattainment for the [1971 primary annual average and 24- hour] S02 NAAQS set fmth inthis section as ofthe effective date of§ 50.17, and areas not meeting the requirements ofa SIP call with respect to requirements for the [1971 ptimary annual average and 24-hour] S02 NAAQS set fmth in this section, the [1971 prirnaty annual average and 24-hour] S02 NAAQS set fmth in this section will applyuntil that area submits, pursuant to section 191 ofthe Clean Air Act [42 U.S.C. § 7514], and EPA approves, an implementation plan providing for attainment ofthe [2010] S02 NAAQS set fmth in§ 50.17. 40 C.F.R. 50.4(e) (2012); 75 Fed. Reg. 35520, 92 (June 22, 2010).
The Board sees various alternatives for codifying this provision. One basic change would apply to all ofthe alternatives: 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 definitively determine whether the 1971 primary annual average and 24-hour NAAQS for sulfuroxides apply to any area ofthe State. Although the federal regulations make it clear that USEPA had not designated any area in Illinois as non-attainment as ofAugust23, 2010 (see 40 CFR 81.314 (20I0)), the federal regulations do not make itclear that no area was "notmeeting the requirements ofa SIP call with respect to requirements for the [1971 primaty annual average and 24-hour] S02 NAAQS" as ofthat date (see 40 C.F.R. 52.720, 52,722, and 52.724 (2012)). The Board was able to detetmine that USEPA had not made any attainment determinations with regard to the 2010 primary one-hourNAAQS for sulfur oxides as ofDecember 31, 2012. See 40 C.F.R 81.314 (2012); Listof SectionsAffected (December 2012), at 82; 77 Fed. Reg. 48062, 71 (Aug. 13, 2012) (pertaining only to ozone). Itis apparent, however, thatthe Agency has recommended area designations for Illinois to USEPA. See letter ofJune 2, 2011 from Laurel Kroack, Chief, Bureau ofAir, Agency, to Chety! A. Newton, Director, Offtce 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 aprovision 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 ftve options and selects one in the following paragraphs. 

### Option 1: Retain theEntire Federal Text with MinimalDeviation. The ftrst option is for the Board to retain the entiTe text of40 C.F.R. 50.4(e) with minimal deviation. ht additionto41

the routine clarifying revisions, this alternative reorganizes the material by moving 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 explanatory 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 f01th in this subsection (a) remain applicable to all areas notwithstanding the promulgation ofthe 2010 p1imary one-hourNAAQS for sulfur oxides in subsection (c) ofthis Section. The 1971 plimary annual average and 24-hour NAAQS for sulfur oxides set f01th in this subsection (a) will no longer apply to an area one year after the effective date ofthe designation ofthat area byUSEPA pursuant to 42 USC 7407 for the 2010 primary one-hourNAAQS for sulfur oxides set f01th in subsection (c) ofthis Section; except that the 1971 plimary 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 f01th 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 sulfuroxides set f01th in this subsection (a) as ofAugust 23, 2010; and B) Areas that had not met the requirements ofUSEPA a SIP call withrespect to requirements for the 1971 ptimmy annual average and 24-hourNAAQS for sulfur oxides set f01th in this subsection (a).
BOARD NOTE: The Board substituted "August 23, 2010" for the open-ended language in conesponding40 CFR 50.4(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, 2010). TheAgency recommended that USEPA designate limited areas of Illinois as non-attainment with the 2010 primary one-hourNAAQS for sulfur oxides. See letter ofJune 2, 20II 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). Whenthe conditions of this subsection (a)(5) have beenfulfilled, 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-hour NAAQS 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 primaryNAAQS will no longer42
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 Board note to the text as would the fll"St 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 20I0 primmyNAAQS for sulfur oxides in subsection (c) ofthis Section. The Board will delete the 1971 primary annual average and 24-hourNAAQS for sulfur oxides set f01th in this subsection (a) after fulfillment ofthe conditions recited byUSEPA in CO!Tesponding 40 CFR 50.4(e) pursuant to 42 USC 7407 for the 2010 primmy one-hourNAAQS for sulfur oxides set forth in subsection (c) of this Section; except that the 1971 p1imary annual average and 24-hour NAAQS 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 p1imary one-hourNAAQS for sulfur oxides set forth in subsection (c) ofthis Section. 

### Option 3: Replace tlze Statement o(lnapplicabilitv witlz a Statement That tlze Board WillRemove tlze 1971NAAOS Wizen 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 primary annual average and 24-hourNAAQS for sulfur oxides after fulfillment ofthe conditions recited in40 C.F.R. 50.4(e). This option would describe when the 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 20I0 primmy one-hourNAAQS for sulfur oxides in subsection (c) ofthis Section. TheBoard will delete the 1971 p1imary annual average and 24-hourNAAQS for sulfur oxides set forth in this subsection (a) after fulfillment ofthe conditions recited by USEPA in corresponding 40 CFR 50.4(e).
BOARD NOTE: Conesponding 40 CFR 50.4(e) recites that the 1971 primaryNAAQS for sulfur oxides remains effective in two types ofareas for which USEPA has not yet approved an implementation plan for attainment with the 2010 primary one-hourNAAQS for sulfur oxides. The first type ofarea is one thatUSEPA had designated as non-attainment for that standard as ofthe effective date ofthe 20I0 primary one-hour NAAQS 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 ofthat date, USEPA had not designated any area in Illinois as non-attainment. See 40 CFR 81.314 (20 10). The Board is unaware ofany USEPA SIP call for any area ofIllinois relative43

to the 1971 primaryNAAQS for sulfur oxides. As ofDecember 31, 2012, USEPA had not yet designated the attaimnent status ofareas inIllinois. See 40 CFR 81.314 (2012). The Agency recommended that USEPA designate limited areas ofIllinois as non-attainment with the 2010 primary one-hourNAAQS. 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). When the 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 tlte Statemento(Inapplicabilitv with aStatement Tfzat tfze Board WillRemove tfze 1971 NAAOS Wizen USEPA MakesAreaDesignations Under tlte 2010 One HourNAAOSorRemoves the 1971NAAOS. The fourth option is a variation ofthe third option. This fourth option is for the Board to replace the text of40 C.F.R. 50.4(e) with a statementthat Board will remove the 1971 primary annual average and 24-hourNAAQS for sulfur oxides afterUSEPA 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 andthe two associated conditional statements in an appended Board note. This second option would add the same explanatory Board note to the text as would the third option. This fourth 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) remain applicable to all areas notwithstanding the promulgation ofthe 20I0 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 forth in this subsection (a) after USEPA has made attaimnent designations with regard to all areas in Illinois underthe 20I0 primmy one-hourNAAQS for sulfur oxides or USEPA has removed the existing standard of40 CFR 50.4. 

### Option 5: Remove tfze SunsetProvision 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. Whenitis clear that all ofthe conditions have been fulfilled, or ifUSEPA removes 40 C.F.R. 50.4, the Board can simply remove 35 

### TIL Adm. Code 243.122(a). The omission ofthe sunset clause in its entirety does not affect the fact that Board removal ofsubsection (a) will berequired to remove the 1971 p1ima1y annual average and 24- hourNAAQS from the Illinois regulations. 

### Selection of Option 3. The Board proposes 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 prima1y NAAQS after fulfilhnent ofthe federal conditions. Option 3 preserves the statement ofapplicability. Option 3 is consistent with the Board's identical-in-44

substance rulemaking practice to maintain a provision until the Board removes it. Option 3 avoids the convoluted conditional statement and its exceptions. Whether the conditions are fulfilled is best dete1mined between USEPA and the Agency.
The Board requests that the Agency inform the Board in the future should USEPA determine that the 1971 primaryNAAQS for sulfur oxides do not applyto any area ofIllinois. The Board can list areas ofinapplicability in future updates to theNAAQS and ultimately remove 35 Ill. Adm. Code 243.122(a) when the 1971 Standards no longer applyto any area of the State.
Section 243.123: Carbon Monoxide. USEPA adopted primary and secondary NAAQS for sulfur oxides in 197.1. 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, only the primary standards remain. The evolution ofthe federal NAAQS for carbon monoxide is outlined as follows (indicating the cmTently codified standards inbold):
1971 Primarv Eight-Hour NAAgs for Carbon Monoxide (Current) Standard: 9 ppm (I0 mg/m)not to be exceeded more than once per year Citation: 40 C.F.R. 50.8(a)(l) (2012) (originally 42 C.F.R. 410.8(a) (1971), then 40 C.F.R. 50.8(a) (1972)) Apri130, 1971 (36 Fed. Reg. 8186): Original adoption as 10 mg/m3 (9 ppm). November 25, 1971 (36 Fed. Reg. 22369, 84): Recodified without substantive reVJSIOll. 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 (10 Jlg/m3), renumbered to subsection (a)(!). August 1, 1994 (59 Fed. Reg. 38906): Retained without revision. August 31,2011 (76 Fed. Reg. 54294): Retained without revision.
1971 Secondary Eight-HourNAAOS for Carbon Monoxide (Revoked) Standard: 9 ppm (I0 mg/m3) not to be exceeded more than once per year Citation: 40 C.F.R. 50.8(a) (1985) (originally 42 C.F.R. 410.8(a) (1971)) April30, 1971 (36 Fed. Reg. 8186): 01iginal 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 Primary 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.F.R. 50.8(a)(2) (2012) (originally 42 C.F.R. 410.8(b) (1971), then 40 C.F.R. 50.8(b) (1972))45

April30, 1971 (36 Fed. Reg. 8186): Oliginal adoption as 10 mg/m3 (9 ppm). November 25, 1971 (36 Fed. Reg. 22369, 84): Recodified without substantive revlSlon. Febmary 18, 1975 (40 Fed. Reg. 7042): Amended to require the use offederally approved monitoling methods (FRMs and FEMs). September 13, 1985 (50 Fed. Reg. 37484): Immaterial change to 9 ppm (10 11g/m3), renumbered to subsection (a)(2). August 1, 1994 (59 Fed. Reg. 38906): Retained without revision. August 31, 2011 (76 Fed. Reg. 54294): Retained without revision.
1971 Secondary One-HourNAAOS for Carbon Monoxide (Revoked) Standard: 35 ppm ( 40 mg/m3) not to be exceeded more than once per year Citation: 40 C.P.R. 50.8(b) (2012) (originally42 C.P.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, 84): Recodified without substantive revision. Febmary 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 plima1yNAAQS for carbon monoxide remain codified in one federal regulation: 40 C.P.R. 50.8. These are a one-hourNAAQS and an eight-hourNAAQS. TheBoardhas codified the two standards in 35 Ill. Adm. Code 243.123. The Boardproposes to replace the existing provisionrelative to carbonmonoxide with the text ofthe federal NAAQS. The single federal provisionrelative to carbonmonoxide appears in a single subsection ofthe Illinois mles. The two NAAQS are codified as follows:

Subsection Federal Citation 243.123(a)(l) 40 C.P.R. 50.8(a)(l)
243.123(b)(2) 40 C.P.R. 50.8(a)(2) NAAQS 1971 primary eight-hourNAAQS for carbon monoxide 1971 primary one-hourNAAQS for carbon monoxide

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 vmious standards. Those notices m·e listed in the foregoing review ofthe federal standards for carbon monoxide in the initial portion ofthis discussion.46

The Board has codified the federal NAAQS for carbon monoxide without substantive revJsJOn. All ofthe deviations from the literal text ofthe federal NAAQS are itemized inTable I. Section 243.124: Nitrogen Oxides. USEPA adopted p1imary and secondary annual average NAAQS 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 curr-ently codified inbold):
1971 Primarv Annual Average NAARS for Nitrogen Oxides (as N07 ) (Current) Standard: 0.053 ppm (100 Jlg/m ) annual arithmetic mean Citation: 40 C.F.R. 50.ll(a)(2012)(originally42 C.F.R. 410.11 (1971)) April30, 1971 (36 Fed. Reg. 8186): Original adoption as 100 Jlg/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 primaryNAAQS and renumbered subsection (a) with immate1ial change to 0.053 ppm (100 Jlglm3) (significant digit added, metric and non-metric units switched). October 8, 1996 (61 Fed. Reg. 52852): Retained without revision. February 9, 2010 (75 Fed. Reg. 6474): Retained with inunaterial change to 53 ppb (units changed, metric units removed).
1971 Secondarv Annual Average NAAOS for Nitrogen Oxides (as NO,) (Current) Standard: 0.053 ppm (100 Jlg/m3 ) annual arithmetic mean Citation: 40 C.F.R. 50.1l(c) (2012) (originally 42 C.F.R. 410.11 (1971), then 40 C.F.R. 50.11 (1972) and 40 C.F.R. 50.1l(b) (1985)) April 30, 1971 (36 Fed. Reg. 8186): Original adoption as aprimary and secondaryNAAQS of I00 Jlg/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 (1 00 Jlg/m3) (significant digit added, metric and non-metric units switched). October 8, 1996 (61 Fed. Reg. 52852): Retained without revision. February 9, 2010 (75 Fed. Reg. 6474): Retained without revision; renumbered subsection (c).
2010 Primary One-Hour NAAOS for Nitrogen Oxides (as NOz) (Current) Standard: 100 ppb three-year average ofthe annual 98thpercentile ofthe daily maximum one-hour average concentration Citation: 40 C.F.R. 50.ll(b) (2012)47

Febmary 9, 2010 (75 Fed. Reg. 6474): Original adoption.
Two ptimary and one secondaryNAAQS for nitrogen oxides are codified in one federal mle: 40 C.F.R. 50.11. The Board has codified the two 1971 standards in 35 Ill. Adm. Code 243.124. The Boardproposes to replace 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 243.124(a) 40 C.F.R. 50.ll(a) 243.124(b) 40 C.F.R. 50.1l(b)
243.124(c) 40 C.F.R. 50.5 NAAQS 1971 primary ammal average NAAQS for nitrogen oxides 2010 primary 24-hourNAAQS for nitrogen oxides 1971 secondary annual average NAAQS for nitrogen oxides

The Board does not engage in substantive review offederal standards in the context ofan identical-in-substance proceeding, except as necessaryto 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 portion ofthis discussion.
The Board has codified the federal NAAQS for nitrogen oxides without substantive revisiOn. All ofthe deviations fiom the literal text ofthe federal NAAQS are itemized in Table 1. 

### Section 243.125: Ozone. USEPA adopted the initial primmy 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 aprimary 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:

21 Photochemical oxidants are pollutants formed in the atmosphere bythe reaction ofnitrogen oxides with hydrocarbons. USEPA, Communications, Education, and Public Affairs, Terms of Environment: Glossary, Abbreviations, andAcronym (Dec. 1997), EPA 175-B-97-001, at 35. Ozone is the principal photochemical oxidant. Others are nitrogen dioxide, peroxyacetyl nitrates, fmmaldehyde, acrolein, and organic peroxides. See Proposed Air Qualitv Standards, R72-7 (July 10, 1975), slip op. at23-24.48

1971 Primary and Secondary One-HourNAAQS for Total Photochemical Oxidants 

### (0J0_ (Removed) Standard: 0.08 ppm not to be exceeded more than one hour per year Citation: 40 C.F.R. 50.9 (1972) (originally 42 C.F.R. 410.9 (1971)) Ap1il 30, 1971 (36 Fed. Reg. 8186): Original adoption as 160 11g/m3 (0.08 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). February 8, 1979 (44 Fed. Reg. 8202): Removed
1979 Primarv and Secondarv One-Hour NAAQS for Ozone (03) (Subject to Sunset) Standard: 0.12 ppm not to be exceeded more than one day per year Citation: 40 C.F.R. 50.9(a) (2012) February 8, 1979 (44 Fed. Reg. 8202): Original adoption as 0.12 ppm (235 fLg/m3). March 9, 1993 (58 Fed. Reg. 13008): Retained withoutrevision. July 18, 1997 (62 Fed. Reg. 38856): Sunset provision added: the standard does not applyto an area after USEPA has designated that the area has attained the 1979 primary and secondary one hour standard. July 20, 2000 (65 Fed. Reg. 45182): Sunset provisionrevised: the standard does not apply to an area once the 2008 primary and secondary eighthour standard is effective and is no longer subject tojudicial review, and afterUSEPA has designated that the area has attained the 1979 primary and secondary one hour standard.22
1997 Primarv and Secondarv Eight-Hour NAAQS for Ozone (03) (Subject to Partial Sunset) Standard: 0.08 ppm annual fourth-highest daily maximum, averaged over three years Citation: 40 C.F.R. 50.1 O(a) (2012) July 18, 1997 (62 Fed. Reg. 38856): Original adoption.

22 As a result oftheAmerican TruckingAssoc. litigation. See supra note 14. Bythis action, USEPA further amended 40 C.F.R. 81.314 to remove an earlier determination that the 1997 primary and secondary one-hourNAAQS for ozone does not apply to areas that were in compliance with the standard. See 65 Fed. Reg. 45182, 83, 220-22 (July 20, 2000); see also 63 Fed. Reg. 31014,41-42 (June 5, 1998) (reinstating original determination ofinapplicability); 63 Fed. Reg. 11842,47 (Mar. 

### II, 1998) (withdrawing original determination ofinapplicability); 63 Fed. Reg. 2726,48-49 (Jan. 16, 1998) (original determination ofinapplicability).49
May 21,2012 (77 Fed. Reg. 30160, 70): Partial sunset provision added: 23 the 1997 primary and secondary eight-hour standard will no longer applyto an area for transportation conformitypurposes only one year afterUSEPA has made a designation ofthe area for the 2008 primary and secondary eight-hour standard.
2008 Primary and Secondary Eight-Hour NAAQS for Ozone (0,) (Current) Standard: 0.075 ppm annual fourth-highest dailymaximum, averaged over three years Citation: 40 C.F.R. 50.15(a) (2012)
March 27, 2008 (73 Fed. Reg. 16483): Original adoption.
Tlu·ee primaty and secondaryNAAQS for ozone are codified in tlu·ee federal rules: 40 C.F.R. 50.9, 50.10, and 50.15. The Board has codified the 2008 ptimary and secondaty eighthourNAAQS for ozone in 35 Ill. Adm. Code 243.125. The Boardproposes to replace the existing provision relative to ozone with the text ofthe federal NAAQS, adding the still-federally codified 1979 primary and secondary one-hourNAAQS and the 1997 primary and secondary eight-hourNAAQS to the text. Each ofthe federal provisions relative to ozone appears in a separate subsection, with the subsection for each ofthe standards. The threeNAAQS for ozone are codified as follows:

Subsection Federal Citation NAAQS 243.125(a) 40 C.F.R. 50.9 1979 Primary and Secondary One-HourNAAQS for Ozone 243.125(b) 40 C.F.R. 50.10 1997 Primary and SecondaryEight-HourNAAQS for Ozone 243.125(c) 40 C.F.R. 50.13 2008 Primary and SecondaryEight-HourNAAQS for Ozone

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 inthe foregoing review ofthe federal standards for ozone in the initial portion ofthis discussion.
The Boardhas 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 1.

23 The 1997 primary and secondary eight-hour standard continues to apply for all other purposes. See 40 C.F.R. 50.10(c)(2012). USEPA explained that the 2008 eight-hour standard replaced the 1997 eight-hour standard, butthe 1997 standard has beenretained for implementation purposes while USEPA fmmulates rules for transition fi·om the 1997 standard to the 2008 standard. See 73 Fed. Reg. 16436, 503 (Mar. 27, 2008).50

Two revisions that the Board has not made warrant discussion. These relate to the continued viability ofthe 1979 one-hour and 1997 eight-hourNAAQS for ozone. 

### Sunsetofthe 1979Primmy andSecondmy One-HourNAAOSfor Ozone. The conditions ofthe sunset clause applicable to the 1979 one-hour standard will be fulfilled before fmal adoption ofthe present amendments. It maybe possible for the Board to omit the material derived from 40 C.F.R. 50.9 from the adopted version ofthe present amendments.
USEPA revoked the 1979 one-hourNAAQS as to all areas ofIllinois effective June 15, 2005. 

### See 40 CFR 81.314 (table for one-hour NAAQS for ozone, note 3; 70 Fed. Reg. 44470, 75 (Aug. 3, 2005). The federal SIP requirements allow the State to apply to USEPA for removal of the obligation for a maintenance plan for the 1979 one-hour standard eight years after such a revocation and any time after USEPA has designated all areas ofthe State for the 2008 eighthour standard. 40 C.F.R. 51.905(e) (2012). Eight years after that revocation is June 15,2013.

· The 1979 standard provides that it no longer applies to an area one year after the effective date ofits area designation by USEPA for the 2008 primary and secondary eight-hour standard for ozone. 

### See 40 C.F.R. 50.9(b) (2012). USEPA designated areas ofIllinois for the 2008 primary and secondary eight-hour NAAQS for ozone effective July 20, 2012. 

### See 40 C.F.R. 81.314 (2012) (the table for the 2008 eight-hourNAAQS for ozone); 77 Fed. Reg. 34221 (June 11, 2012) (designation ofareas surrounding Chicago); 77 Fed. Reg. 30088 (May21, 2012) (designation ofthe rest ofIllinois). Thus, it appears that the 1979 one-hourNAAQS for ozone will not apply to any area of Illinois after July20, 2013. It also appears that the State may apply to USEPA to remove the requirement for a maintenance plan for the 1979 one-hour standard afterJune 15,2013. The Board has included the 1979 one-hourNAAQS in this proposal for public comment, but it is possible thatthe Board mayremove the standard from the final version ofthese mles. The Board cannot adopt standards that do not apply to persons or facilities in Illinois. 415 ILCS 5/7.2(a)(l) (2012). 

### PartialSunset o(the 1997PrimmyandSecondmyEight-HourNAAOS tor Ozone. The conditions ofthe sunset clause applicable to the 1997 eight-hour standard will be fulfilled before final adoption ofthepresent amendments. This sunset, however, is partial-forpurposes oftransportation conf01mity alone. The partial 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-hourNAAQS for ozone); 77 Fed. Reg. 34221 (June 11, 2012) (designation ofareas sun·ounding Chicago); 77 Fed. Reg. 30088 (May 21, 2012) (designation ofthe rest ofIllinois). The Boardproposes including 40 C.F.R. 50.10 in the present amendments due to the patiial nature ofthe sunset provision.
Section 243.126: Lead. USEPA adopted the 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 plimaryNAAQS for lead are outlined as follows:51

1978 Primarv Calendar puarterlv Average NAAQS for Lead (Subject to Sunset) Standard: 1.5 f!g/m maximum mithmetic mean averaged over a calendar quarter not to be exceeded intotal 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. November. 12, 2008 (73 Fed. Reg. 66964): Renumbered to subsection (a); sunset provision added: the standard does not applyto an area one year after USEPA designation ofthe attainment status ofthat area under the 2008 primary and secondarytlu·ee-month average standard,

. h

. '4 w1t one exceptwn-

. 2008 Primarv Three-Month Average NAAQS for Lead (Current) Standard: 0.15 f1g/m3arithmetic mean averaged over a tlu·ee-month period Citation: 40 C.F.R. 50.16(a) (2012)
November. 12, 2008 (73 Fed. Reg. 66964): Original adoption.
Both primaryNAAQS for lead remain codified intwo federalmles: 40 C.F.R. 50.12 and 50.16. The Board has codified the 2008 primary three-monthNAAQS for lead in 35 Ill. Adm. Code 243.126. The Board proposes to replace the existing provision relative to lead with the text ofthe federal NAAQS, adding the 1978 p1ima1y calendar quarterlyNAAQS for lead to the text. Each ofthe federal provisions relative to lead appears in a separate subsection, one for each of the I978 and 2008 standards. The two NAAQS for lead are codified as follows:

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

The Board repeats that 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 airregulations. Persons wishingto 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 inthe 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 inTable I. The Board

24 The exception relates to areas deemed not in attainment with the 1978 standard before the effective date ofthe 2008 standard.52

discusses here only one significant issue relating to the federal standards: sunset provision inthe 1978 primaryNAAQS for lead. The issue did not result indeviation from the federal text. 

### Sunset ofthe 1978Primmy Calendar OuarterlvAverageNAAOS torLead. 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 inthis proposal.
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. 50.12(b)(2012); 73 Fed. Reg. 66964 (November. 12, 2008). The sunset clause provides that the 1978 NAAQS no longer applies to an area that USEPA has designated for the 2008 standard one year after the effective date ofthe designation, except for areas that USEPA has designated "non-attainment" with the 2008 standard. 

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

### Seeld.
Forthe 2008 NAAQS for lead, USEPA has designated two areas ofthe state as nonattainment and the rest ofthe State as "unclassifiable/attainment." The two non-attainment 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 or maintenance 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 PM 10 The Board monitors USEPA actions inthe several identical-in-substance subject areas25
on an ongoing basis for USEPA actions that would require Board rulemaking activity. Ifthe Board observes a USEPA action subsequent to the nominal timeframe ofanidentical-insubstance proceeding that affects the same subject matter, the Board has included that later action within the mles under development. 

### See, e.g., SDWA Update. USEPA Amendments (January 

### I. 2012 through June 30.2012. and July 25. 2012), Rl3-2 (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), R09-16, RCRA Subtitle C Update. USEPA Regulations (January 

### I. 2009 through June 30. 2009), Rl0-4 (June 17, 2010), slip op. at 5-6,272 (withdrawing amendments); SDWA Update. USEPA Amendments (January I. 2007 though June 30. 2007 and June 3. 2008), R08-7, SDW A Update. USEPA Amendments (July I. 2007 though December 31. 2007). R08-13 (Dec. 18, 2008), slip op. at 4, 8 (adding amendments).

25 Defmition ofvolatile organic material, 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).53

OnJanuary 15,2013, USEPA detetmined to retain the 1987 primary and secondary 24- hour NAAQS for PM 10, revised the data handling conventions applicable to all four ofthe PM2.5 NAAQS 26

, and adopted two new NAAQS for patticulate matter27 There are one new NAAQS for PM10 and three new NAAQS for PM2.5. Those standards are the following (using the format employed above for all ofthe historical and existingNAAQS):
1987 Primary and Secondary 24-Hour NAAQS for PM10 Standard: !50 [.tg/m3not 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. 28 December 22, 2000 (65 Fed. Reg. 80776): Sunsetprovision removed29 January 15,2012 (78 Fed. Reg. 3086): Retained without revision.
1997 Primary and Secondary Annual Average NAAQS for PM2 5 Standard: 15.0 [.tg/m3arithmetic mean, 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). January 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 Primary and Secondary 24-HourNAAQS for PM,.s Standard: 65 [.tg/m398th percentile, averaged overthree years Citation: 40 C.P.R. 50.7(a) (2012) (miginally 40 C.P.R. 50.7(a)(l) (1998))

26 The 1997 and 2006 Primary and secondary annual average and 24-hourNAAQS for PM2.5•
27 The USEPA NAAQS webpage (www.epa.gov/ttn/naaqs/standards/pm/s_pm_histmy.html) lists all ofthe remaining standards as 2012 standards: the primary annual NAAQS for PM2.5, added as 40 C.P.R. 50.!8(a); the secondaty annual NAAQS for PM2
.5, which remains unchanged as 40 C.P.R. 50.13(a) (the 2006 standard); the primaty 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 primm·y and secondary 24-hourNAAQS for PM 10, which remains codified as 40 C.P.R. 50.6(a) (the 1987 standard).

28 Not described inthis summaty outline because USEPA subsequentlyremoved the sunset provision. See 40 C.P.R. 50.6(d) (1998) (the removed sunset provision).

29 As a result ofthe decision in American Tmcking Assoc. v. EPA, 175 F. 2d 1027, modified en bane, 195 F.3d 4 (D.C. Cir. 1999), aff'd inpartandrev 'dinpartsub nom. Whitman v. American Tmcking 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).54

July 18, 1997 (62 Fed. Reg. 38652): Original adoption. July 30, 2004 (69 Fed. Reg. 45592): Renumbered to subsection (a). 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 Secondary Annual Average NAAQS for PM2.s Standard: 15.0 f.lg/m3arithmetic mean, averaged overthree 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 PMz 5 Standard: 35 f.lg/m398th percentile, averaged over three years Citation: 40 C.F.R. 50.13(a) (2012)
October 17, 2006 (71 Fed. Reg. 61144): Original adoption. Janumy 15, 2012 (78 Fed. Reg. 3086): Retained without revision, but subjectto revised data handling conventions in appendix N to 40 C.F.R. 50.
2012 Primarv Annual Average NAAQS for PM, 5 Standard: 12.0 f.Lg/m3arithmetic mean, averaged over tlu·ee 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 f.lg/m398thpercentile, 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 the January 15, 2013 federal amendments relating to PM2.5 with this initial adoption ofidentical-in-substanceNAAQS standards. Addingthe 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 whether the Board adopts the Janumy 13,2013 federal amendments in this proceeding orin a separate proceeding that could conclude as late as January 14,2014. 30

30 See 415 ILCS 5/7.2(b) (2012).55
Requests for Public Comments
The Board requests comments on general aspects ofthe proposal forpublic comment, such as the Board's approach to the statutory mandate, the standardized naming oftheNAAQS in the text, the choice ofstructure, complete replacing ofthe existing Illinois standards, the incorporations byreference, etc. The Board requests public comments on specific aspects ofthe proposal. The specific requests for comments are itemized as follows:
1. Removal ofmonitoring locations requirement: Is it tmethat the design, location, and operation ofmonitoring locations and networks occurs as a matter offederal law? Is ittme that the design, location, and operation ofmonitoring locations and networks is subject to USEPA review and approval? Is there any reasonthe Illinois NAAQS regulations should include incmporation of40 C.F.R. 58 by reference? Ifthe Board should retainthe monitoring requirement, is the following language in 35 Ill. Adm. Code 243.106 sufficient?
All monitoring perfmmed to fulfill the requiTements ofthis Part must be performed at stations and networks ofstations designed, located, and operated according to plans approved byUSEPA according to the requirements of40 C.F.R. 58.
2. Removal ofnon-degradation requirement: Do the federal PSD requiTements render the non-degradationmle of35 Ill. Adm. Code 243.104 unnecessary? Is there anyway that the Board should perceive non-degr·adation as a segment ofthe federal NAAQS?
3. USEPA approvals ofFRMs and FEMs: Will the unavoidable delay in incmporation ofUSEP A methods designations into the illinois regulations create difficulty in implementation ofthe federal NAAQS in Illinois? Is there any available alternative that could minimize the delay?
4. Expiration ofthe 1979 one-hourNAAOS for ozone: Is it true that the 1979 standard for ozone will not apply to any area ofIllinois after July 20, 2013? Ifso, may the Boardremove the 1979 one-hour standard for ozone afterthat date?
5. Expiration ofthe requirement for a maintenance plan for the 1979 one-hour NAAQS for ozone: Is it tmethat the State may apply to USEPA to remove the requirement for a maintenance plan for the 1979 one-hourNAAQS for ozone after June 15, 2013? Ifso, may the Boardremove the 1979 one-hour standard for ozone after that USEPA approval?
6. Partial expiration ofthe 1997 prinrary and secondary eight-hourNAAQS for ozone: Is it huethat that the 1997 eight-hour standard for ozone will no longer applyto any aTea after June 15, 2013 for transportation conformity purposes? For what purposes will that 1997 standard continue to apply? What event or series of56

events could occur within the next few years that could warrant removal ofthe 1997 from the Illinois regulations?
7. Expiration ofthe 1978 primary calendar quarterly average NAAQS for lead: Is it true that the 2011 and 2012 area designations for the 2008 NAAQS for lead rendered the 1978 calendar quarterlyNAAQS for lead inapplicable to all areas of Illinois except for the two limited non-attainment areas? What is the current status ofthe State obtaining an approved attaimnent ormaintenance plan for those two areas? When USEPA has approved an attainment or maintenance planfor those areas, should the Board remove the 1978 NAAQS for lead from the Illinois regulations?
8. General re removal ofexpired NAAOS: When the Board observes that the conditions in a sunset clause applicable to a NAAQS may have been fulfilled, should the Board propose deletion ofthat standard? As a second alternative, should the Board wait until USEPA has expressly codified that the NAAQS does not applyto any area inIllinois? As a second alternative, should the Board leave thatNAAQS in the Illinois rules until USEPAhas removed that standard from 40 C.F.R. 50?

Deviations from the Literal Text ofthe Federal Amendments

and Non-Federally Derived Corrections and Clarifications
The Board routinely examines federal amendments and the base text ofrules open for amendments to find any areas that need correction orclarification. JCAR and the Office ofthe Secretary ofState also routinely examine the text and suggest corrections and clarifications. Sometimes suggestions arise from the Agency, USEPA, ormembers ofthe regulated community. The Board often makes revisions as a result. The revisions thus made ar·e not directly derived from federal amendments. The Board is evermindful ofthe limited discretion authorized inthe context ofan identical-in-substance proceeding. The Board is limited to "those changes that are necessary for compliance with the lllinois Administrative Code," "technical changes that in no way change the scope ormeaning ofany portion ofthe regulations," and "apparent typographical 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 corrections are non-substantive in effect. Tables follow that document the corrections and clarifications made in this proceeding. The first lists the deviation from the literal text ofthe USEPA amendments involved inthis proceeding. The second lists the correction made in this docket that was not prompted byfederal amendments.
Tabulations ofDeviations from the Literal Text ofthe Federal Amendments and Miscellaneous Board Housekeeping Amendments.
The tables below list numerous corrections and amendments that are not based on current federal amendments. Table 1 (beginning immediatelybelow) lists a number offederal amendments thatthe Board has not included inthis docket. Table 1 gives a briefexplanation why the Board has declined to make each. Table 1 (begilliling innnediatelybelow) includes57

deviations made in this proposal for public comment from the verbatim text ofthe federal amendments. Table 2 (beginning immediately after Table 1 onpage 91) contains corrections and clarifications that the Board made in the base text involved in this proposal. The amendments listed inTable 2 are not directly detived from the current federal amendments. Some ofthe entties in these tables are discussed fmther in appropriate segments ofthe general discussion beginning at page 8 ofthis opinion.
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 'Treatmentof' from before 243.105 heading "airquality monitoring data"; capitalized the first letter ofeach word inthe heading.
243 table ofcontents, Table I to 50.14(c)(2)(vi) Removed "Datato be Used for 243.105 heading heading Designations Decisions" from before "forNew orRevisedNAAQS"; changed the fmmat from large and small capital letters to standard fmmat with capitalization ofthe first letter ofeach word in the heading.
243.101 generally 40 C.P.R. 50.1 Replaced the existing language with new language more directly derived from the corresponding federal provision.
243.101 preamble 40 C.P.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.P.R. 50.l(b) Placed the defmed tennin quotation marks; changed the defmition fiom meaning the federal CAA, as amended, to mean the Environmental Protection Act.58

243.101 "Agency" 40 C.F.R. 50.l(c) Placed the defined te1m in quotation marks; changed the definition from meaning USEPA, as amended, to mean the Illinois EPA. 243.101 "CleanAir 40 C.F.R. 50.1(b) Created the separate defined te1m to Act" mean the federal statute; placed the defined te1m in quotation marks; added the alternative defined abbreviated term "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 defmed te1m inquotation ofan NAAQS" marks; moved the defmition into alphabetic order; changed the long defined term "exceedance with respect to a national ambient air quality standard" to the shorter fonn "exceedance ofan NAAQS." 243.101 "exceptional 40 C.F.R. 50.1G) Placed the defmed te1m in quotation event" marks; moved the defmition into alphabetic order; added "fulfills all of the following crite1ia" and a colon after "that"; divided so to place each criterion into a separate subsidiary paragraph; added "the event" (four times); changed the connnas to semicolons to separate each criterion; changed "Administrator" to "USEP A"; changed "itdoes not" to "an 'exceptional event' does not"; added "anyofthe following," followed by a colon, and subdivided the conditions into subsidiaryparagraphs; changed the separating commas to semicolons.59

243.101 "federal 40 C.P.R. 50.l(g), Placed the defmed te1m in quotation equivalent method" 50.1l(d)(2), and 53.1 marks; moved the definition into alphabetic order; added "federal" to the defined te1m and the abbreviated alternative definition "PEM"based on the definition 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 with part 53 ofthis chapter" to "pursuant to 40 CPR 53 and which is listed included in List of Designated Methods, including later updates, as incorporated byreference

... 243.108"; changed "it does not include" to "thete1m 'federal equivalent method' does not include"; changed "for which 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.l(g), Added explanation ofthe derivation of equivalent method" 50.ll(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.60

243.101 "federal 40 C.F.R. 50.l(f) and Placed the defmed term in quotation reference method" 53.1 marks; moved the definition into alphabetic order; added "federal" to the defined term and the abbreviated altemative definition "FRM" based on the definition that appears at closely related 40 C.F.R. 53.1; changed "that has been designated" to active-voice "thatUSEPA has designated" (twice); changed "in an appendix to this pmi"to "in an appendix to 40 CFR 50, incorporated

... 243.108"; changed "in accordance withpmi 53 ofthis chapter" to "pursuantto 40 CFR53 and which is listed included in List ofDesignated Methods, including later updates, as incorporated byreference

... 243.108"; changed "it does not include" to "the tem1 'federalreference method' does not include"; changed "forwhich an reference method designationhas 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 CFR 53.11 or 53.16"; added the parenthetical "as reflected in

... Section 243.108." 243.101 "federal 40 C.F.R. 50.l(f) a11d Added explanation ofthe derivation of reference method" 53.1 the defmition from multiple sources; Board note added expla11ation of"includinglater updates"; added explanation ofthe effectiveness ofdesignation ofan FRM a11d cancellation ofan FRM. 243.101 "micrograms 40 C.F.R. 50.6(a); Added the definition ofthe term and the per cubic meter" 50.7(a), and 50.13(a) and abbreviated form to suppmi consistent 58.1 (definitions of use ofthe abbreviated form throughout PM2.s, 

### PMw, PM

### we, and the text. PM10-2.s)61

243.101 "micrograms 40 C.F.R. 50.6(a); Added explanation that the Board added per cubic 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 "milligrams per cubic 58.1 (definitions of meter." PM2
.5, PM10, PM10c, and PM10-2.s) 243.101 "milligrams 40 C.F.R. 50.8(a)(l) and Added the defmition ofthe term and the per cubic meter" (a)(2) abbreviated form to support consistent use ofthe abbreviated form throughout the text. 243.101 "National 40 C.F.R. 50 generally, Borrowed the definition ofthe term and Ambient Air Quality and "Tetms of the abbreviated fonn to support Standards" Enviromnent: Glossaty, consistent use ofthe abbreviated form Abbreviations, and throughout the text; changed plural Acronyms" (Dec. 1997) "National Ambient Air Quality Standards" to singular; changed plural "standards" to singular "a standard"; changed "EPA" to "USEP A"; changed "the country" to "theUnited States." 243.!01 "National 40 C.F.R. 50 generally, Added explanation ofthe added Ambient Air Quality and "Tetms of definition and its source. Standards" Board note Environment: Glossary, Abbreviations, and Acronyms" (Dec. 1997) 243.101 "natural 40 C.F.R. 50.1(±) and Placed the defmed tetm in quotation event" 53.1 marks; moved the definition into alphabetic order. 243.101 "partsper 40 C.F.R. 50 generally, Derived the defmition and the billion" and "Tetms of abbreviated form to support consistent Enviromnent: Glossary, use ofthe abbreviated form throughout Abbreviations, and the text. Acronyms" (Dec. 1997) 243.101 "pru1s per 40 C.F.R. 50 generally, Added explanation ofthe added billion" Board note and "Terms of definition and the definition of"partsper Enviromnent: Glossary, million" and their source. Abbreviations, and Acronyms" (Dec. 1997)62

243.101 "partsper 40 C.F.R. 50 generally, Derived the defmition and the million" and "Terms of abbreviated form to suppmt consistent Environment: Glossaty, use ofthe abbreviated form throughout Abbreviations, and the text. Acronyms" (Dec. 1997)
243.101 

### "PMw" 40 C.F.R. 50.6(c) De1ived the definition ofthe abbreviated parenthetical form to support consistent use ofthe abbreviated fonn throughout the text; placed the defined te1m in quotation marks; changed "pmticles having" to "particulate matter that has"; added the abbreviation "f.!m" in parentheses. 243.101 "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 defmition ofthe abbreviated parenthetical form to support consistent use ofthe abbreviated form thmughout the text; placed the defined te1m in quotation marks; changed "pmticles having" to "pmticulate matterthat has"; added the abbreviation "f.!m" inparentheses. 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 defmed te1m inquotation marks; moved the defmition into alphabetic order; added the comma before "such as a National Bureau of Standards

... reference Manual (CRM)" to offset the parenthetical. 243.101 "USEPA" 40 C.F.R. 50.l(c) Added the defmition based on the federal definition of"Agency"; changed the defined term to "USEPA"; added "United States" before "Environmental Protection Agency." 243.101 "USEPA" 40 C.F.R. 50.1(c) Added explanation ofthe derivation and Board note use ofthe defmed term inthe text. 243.101 Board note 40 C.F.R. 50.1 generally Added explanation ofthe derivation of this Section.63

243.102 heading 50.2 heading Changed the heading from "Preamble" to "Scope" to cotTespond with the federal regulations.
243.102 generally 50.2 generally Replaced the existing language ofthis Section withthat ofthe corresponding federal regulation. 243.102(a) 50.2(a) Changed "as set forth in this part" to "This Part sets forth" 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 I09 ofthe Act" to "section I09 ofthe CAA (42 USC 7409)"; added "and incorporated into this Partpursuant to 415 ILCS 5/7.2 and IO(H)." 243.102(b) 50.2(b) Added the parenthetical "(primary NAAQS)"; changed "whichthe Administratorjudges" to "thatUSEPA hasjudged" (twice); added the parenthetical "(secondaryNAAQS)"; changed "primaty and secondary standards" to "primary and secondary NAAQS"; changed "theAdministrator" to "USEP A." 243.102(c) 50.2(c) Changed "primary and secondary ambient air quality standards" to "primary and secondaryNAAQS"; changed "any State or Indian counhy" to "this State."
243.102 Boardnote 40 C.F.R. 50.2 generally Added explanation ofthe derivation of this Section.
243.103 None Retained the applicability statement, despite the lack ofa federal counterpart. 243.105 generally 50.14 generally Added the provision relative to monitoringdata and exceptional events that had not counterpart in the Illinois regulations.

### 64

243.105 heading 50.14 heading Removed "Treatment of' fi·om before "airquality monitoring data"; capitalized the first letter ofeach word in the heading. 243.105(a)(l) 50.14(a)(l) Changed Ha State" to "the Agency"; change "EPA" to "USEPA"; moved "fromuse in the detetminations" 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 Agencymust"; changed "bydemonstrating to USEPA's satisfaction" to active-voice "demonstrateto USEPA." 243.105(a)(2) 50.14(a)(2) Added the indefmite article 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)(1) Added the topical heading "Exceptional 

### events."; changed "EPA" to "USEPA"; added "has stated that it will"; changed "exceedances or NAAQS violations" to the singular defined term "exceedance of an NAAQS"; changed "a State demonstrates to EPA's satisfaction" to "theAgency has demonstrated"; changed "one or more national ambient air quality standards" to "one ormore NAAQS"; created an independent clause byplacing a comma before and changing "and othetwise satisfies" to "andthe Agency othetwise satisfies"; changed "this section" to "40 CFR 50.14."

### 65

243.105(b)(2) 50.14(b)(2) Added the topical heading "Fireworks displays."; changed "EPA" to "USEP A"; 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 Agency has demonstrated"; changed "one or more national ambient air quality standards" to "one or more NAAQS"; added "USEPA has stated that" before "such data"; changed "a State demonstrates" to "theAgency has demonstrated"; added a comma before 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 defmed term "exceedance ofan NAAQS"; changed "a State demonstrates to EPA's satisfaction" to "theAgency has 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 othetwise satisfies" to "andthe Agency othetwise satisfies"; changed "this section" to "40 CFR 50.14"; changed "definition in § 50.1U)" to "definition of"exceptional event in Section 243.101"; changed "State" to "Agency''; changed "it" to "the State"; added the parenthetical abbreviation "(SMP)"; changed "State" to lower-case "state"; changed "the State" to "the Agency"; changed "its" to "the State's."

### 66

243.105(b) Board note 50.14(b) Added explanation ofthe shift fi·om "EPA shall" to "USEP A has stated that it will" in all occuJTences inthis subsection; added explanation of reliance on the defined te1m "exceedance ofan NAAQS" inplace 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)(l),since there is no paragraph (c)(l)(ii); changed "All States and, where applicable, their political subdivisions" to "the Agency or, where the Agencyhas delegated authoritypursuant to Section 4(g) or (r) ofthe Act [415 ILCS 5/4(g) or (r), the Agency's delegatee"; changed "exceedance ofan applicable air quality standard" to the defined term to "exceedance 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 ofan NAAQS"; 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 term "exceedance ofan NAAQS"; changed "EPAnotifies the State" to "after USEPA notifies the Agency" and moved it from before "byplacing as concun·ence flag" to follow "until"; changed "ofits concuJTence following the State's" to "ofUSEPA concunence following the Agency's"; changed "its demonstration" to "a demonstration."
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."

### 67

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 "whenEPA" to "USEPA has stated that when USEPA"; changed "its" to "USEP A"; added the conunabefore "andproviding" to offset the final element ofa series; changed "Table 1 provides the schedule" to "Table A to this Part 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 to this Pmt 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 Agencyhas flagged

... and is requesting exclusion of

... data shall, the Agencymust"; changed "to EPA"to "to USEPA" and moved it from after "data exclusion" to follow "a demonstration"; changed "the lesser of, 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."
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.68

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.P.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 inTable 2 below. 243.107 Board note 50.3 generally Added explanation ofthe derivation of this Section. 243.108 50.4(c); 50.5(b); 50.6(a), Added this provision for inclusion of (c)(l), and (c)(2); required methods and intetpretations by 50.7(b)(l) and (b)(2); incorporation byreference to the 50.8(b)(1) and (b)(2); appendices to 40 C.P.R. 50 and the List 50.9(a); 50.10(a) and (b); ofDesignated Methods. 50.ll(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, P, G, H, I, J, K, L, M,N,O,P, Q,R, S, S, and T to 40 C.P.R. 50 generally69

243.120 50.6, 50.7, and 50.13 Replaced the existing language of

### this generally Section with that ofthe corresponding federal regulations. 243.120(a) 50.6 heading Changed "national primaty and secondary ambient airquality standards for PM10" to "1987 primary and secondary 24-hourNAAQS for PM10
.

### , 243.120(a)(l) 50.6(a) Changed "national primaty and secondary 24-hour ambient air quality standards for particulate matter" to "1987 primary and secondary 24-hour NAAQS for PM10"; changed "micrograms per cubic meter (/-Lg/m3)" to the defined term "!-Lg/m3"; changed "standards are" to "1987 primary and secondary 24-houorNAAQS for PM10 is"; changed "this part" 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 corresponding federal rule. 243.120(a)(3) 50.6(c) Changed "primary and secondary standards" to "1987 primary and secondary 24-hourNAAQS for PM10"; changed "shall" to "must"; removed the parenthetical "(particles with an aerodynamic diameter less than or equal to a nominallO micrometers)," which has become the basis for a definition of "PM10" in Section 243.101 (see the entry above in 

### this Table 1); added "bya method that fulfills either ofthe following requirements."70

243.120(a)(3)(A) 50.6(c)(l) Changed "a reference method" to the defined abbreviation "an FRM"; changed "this part" 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 "in List ofDesignated Methods, incorporated byreference in Section 243.108." 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 with part 53 ofthis chapter" to "inList ofDesignated Methods, incorporated by reference 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 "nationalprimmy and secondary ambient air quality standards for PM2

_ 5" to "1997 primary and secondary atmual average and 24-hour NAAQS for PM2.s-"71

243.120(b)(l) 50.7(a) Changed "thenational primary and secondary 24-hour ambient air quality standards for particulate matter are ... annual arithmetic mean concentration, and

... 24-hour average concentration" to "1997 prima1y and secondary annual average NAAQS for PM 10 is

... , annual arithmetic mean concentration, and

... , 24-hour average concentration,"; changed "microgramsper cubic meter (f.Lg/m3)" to the defined te1m "fLg/m3"; removed the parenthetical "(particles with an aerodynamic diameter less than or equal to a nominal2.5 micrometers)," which has become the basis for a definition of"PM2
.5" 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(b)(1)(A) 50.7(a)(l) Changed "a reference method" to the defined abbreviation "an FRM"; changed "this part" to "40 CFR 50, incorporated byreference

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

### in" after "and designated"; changed "in accordance with pmt 53 ofthis chapter" to "in List ofDesignated Methods, incorporated byreference in Section 243.108." 243.120(b)(1)(B) 50.7(a)(2) Changed "an equivalent method" to the defined abbreviation "anFEM"; added "byUSEPA and listed in" after "and designated"; changed "in accordance withpart 53 ofthis chapter" to "in List ofDesignated Methods, incorporated by reference in Section 243.108."72

243.120(b)(2) 50.7(b) Changed "annualprimary and secondary PM2.s 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 "micrograms per cubic meter" to the defined term "f!g/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

_ 5 is"; changed "this part" to "40 CFR 50, incorporated byreference

... Section 243.108"; changed "micrograms per cubic meter" to the defined term "f!g/m3." 243.120(b) Board note 50.7 generally Added explanation ofthe derivation of subsection (b); added explanations ofthe differences between the 1997 and 2006 NAAQS for PM2.s and Board retention ofthe 1997 NAAQS for PM2
.5. 243.120(c) 50.13 heading Changed "national primary and secondary ambient air quality standards for PM2.s" to singular "2006 primary and secondary annual average and 24-hour NAAQS for PM25 ."73

243.120(c)(l) 50.13(a) Changed "national primary and secondary ambient airquality standards for patiiculate matter are ... annual arithmetic mean concentration, and

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

... , annual arithmetic mean concentration, and the 2006 primary and secondary 24- hourNAAQS for PM10 is

... , 24-hour average concentration,"; changed "micrograms per cubic meter**(~g/m )"**  to the defined term**"~g/m ";**  removed the parenthetical "(patiicles with an aerodynamic diameter less than or equal to a nominal2.5 micrometers)," which has become the basis for a definition of "PM2
.5" 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)(l)(A) 50.13(a)(l) Changed "areference method" to the defined abbreviation "an FRM"; changed "this part" to "40 CFR 50, incmporated byreference

... Section 243.108"; added "byUSEPA and listed in" after "and designated"; changed "in accordance with part 53 ofthis chapter" to "inList ofDesignated Methods, incorporated byreference in Section 243.108." 243.120(c)(l)(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 part 53 ofthis chapter" to "in List ofDesignated Methods, incorporated by reference in Section 243.108."74

243.120(c)(2) 50.13(b) Changed "annual primmy and secondary PM2
.5 standards are" to singular "2006 primary and secondary annual average NAAQS for PM2
.5 is"; changed "this part" 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 primary and secondary 24-hourNAAQS for PM2.5 is"; changed "this part" 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 conesponding federal regulations. 243.122(a) 50.4 heading Changed "national primary ambient air quality standards" to "1971 primary 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 "pmis per million (ppm)" to the defined te1m "ppm"; changed "shall" to "must" (twice). 243.122(a)(2) 50.4(b) Changed "standard" to "1971 primary 24-hourNAAQS for sulfur oxides"; changed "partspermillion (ppm)" to the defined term "ppm"; changed "shall" to "must" (three times).75

243.122(a)(3) 50.4(c) Changed "shall"to "must"; changed "sulfur dioxide" 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 withpa1i 53 ofthis chapter" to "inList ofDesignated Methods, incorporated by reference 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-, or23-hour averages"; changed "using 18, 19, etc." to "using the number ofhours (i.e., 18, 19, etc.)." 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 "the Board will delete the 1971 primary annual average and 24-hourNAAQS for sulfur oxides

... after fulfillment ofthe conditions recited byUSEPA in corresponding 40 CFR 50.4(e)" and deleted all following material.

### 76

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 clearlybeen 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-hour NAAQS"; 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 "partsper million (ppm)" to the defmed term "ppm"; changed "3-hour" to written "threehour" (twice); changed "shall" to "must" (three times); changed "nonoverlapping" to hyphenated "non-overlapping"; changed "1" to written "one." 243.122(b)(2) 50.5(b) Changed "shall" to "must"; changed "sulfur dioxide" to the defined abbreviation "S02"; changed "reference method" to the defmed abbreviation "FRM"; changed "appendix A" to "appendix A-2"; changed "thispart" to "40 CFR 50, incorporated by reference

... 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 "inList ofDesignated Methods, incorporated by reference in Section 243.108."77

243.122(b)(3) 50.5(c) Changed "3-hour" to written "threehour" (six times); changed "shall"to "must" (three times); changed "3"to written "three." 243.122(b) Board note 50.5 generally Added explanation ofthe delivation of subsection (b). 243.122(c) 50.17 heading Changed "nationalp1immy and secondary ambient air quality standards for sulfur oxides (sulfur dioxide)" to "1987 primary and secondaryNAAQS for PM 10." 243.122(c)(l) 50.17(a) Changed "national p1immy !-hour annual ambient air quality standard for oxides ofsulfur" to "2010 primary onehourNAAQS for sulfur oxides"; changed "parts perbillion (ppm, which is I part in I,000,000,000)" to the defined te1m "ppb"; changed "sulfur dioxide (S02)" to the defmed abbreviation "S02 ." 243.122(c)(2) 50.17(b) Changed "!-hourprimmy ambient standard" to "2010 one-hour primary NAAQS for sulfur oxides"; changed "Ihour" to written "one-hour"; changed "this part" to "40 CFR 50, incorporated byreference

... Section 243.108." 243.122(c)(3) 50.17(c) Changed "standard" to "20I0 one-hour primaryNAAQS for sulfur oxides"; changed "appendix A orA-1" to "appendix A-1 orA-2"; changed "this part" to "40 CFR 50, incorporated by reference

... Section 243.108"; changed "a Federal Equivalent Method (FEM)" to the defined abbreviation "an FEM"; added "byUSEPA and listed in" after "and designated"; changed "in accordance with pa1i 53 ofthis chapter" to "in List ofDesignated Methods, incorporated byreference in Section 243.108."78

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 Sectionwith that ofthe corresponding federal regulation. 243.123(a) 50.8(a) Changed "national primmy ambient air quality standards" to "1971 eight-hour and one-hour p1imary NAAQS"; added "as follow." 243.123(a)(l) 50.8(a)(1) Changed "an 8-hour average concentration" to written "an eight-hour average concentration of' and moved to the beginning ofsubsection (a)(1); changed "parts permillion" to the defined abbreviation "ppm"; changed "milligrams per cubic meter" to the defined abbreviation "mg/m3"; added a comma before "notto be exceeded" to offset the parenthetical. 243.123(a)(2) 50.8(a)(2) Changed "a 1-hour average concentration" to written "an eight-hour average concentration of' and moved to the beginning ofsubsection (a)(2); changed "pmts permillion" to the defined abbreviation "ppm"; changed "milligramsper cubic meter" to the defined abbreviation "mg/m3"; added a comma before "notto be exceeded" to offsetthe parenthetical. 243.123(b) 50.8(b) Changed "shall" to "must"; added "a method that fulfills either ofthe following requirements."

### 79

243.123(b)(l) 50.8(b)(I) 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 withpart 53 ofthis chapter" to "in List ofDesignated Methods, incorporated by reference in Section 243.108." 243.123(b)(2) 50.8(b)(2) Changed "an equivalent method" to the defined abbreviation "anFEM"; added "byUSEPA and listed in" after "and designated"; changed "in accordance with part 53 ofthis chapter" to "inList ofDesignated Methods, incorporated by reference in Section 243.108." 243.123(c) 50.8(c) Changed "8-hour" to written "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." 243.123(d) 50.8(d) Corrected the spelling "compalision" to "comparison"; changed "shall" to "must" (twice); changed "patts per million" to the defined term "ppm."
243.123 Board note 50.8 generally Added explanation ofthe delivation of Section 243.123.
243.124 50.11 generally Replaced the existing language ofthis Section with that ofthe corresponding federal regulations.
243.124 heading 50.11 heading Changed "national primary ambient air quality standards" to singular "nitrogen oxides (nitrogen dioxide as indicator)."80

243.124(a) 50.11(a) Changed "national primmy ambient air quality standard for oxides ofnitrogen" to "1971 primary annual average NAAQS for nitrogen oxides"; changed "parts perbillion" to the defmed abbreviation "ppb"; added "(N02)" as a defined abbreviation after "nitrogen dioxide." 243.124(b) 50.ll(b) Changed "national primmy !-hour ambient air quality standard for oxides ofnitrogen" to singular, written, and with defmed abbreviations "2010 primary one-hourNAAQS for nitrogen oxides"; changed "nitrogen dioxide" to the defmed abbreviation "N02 ." 243.124(c) 50.ll(c) Changed "national p1imary ambient air quality standard for nitrogen dioxide" to singular "1971 secondm·y annual average NAAQS for nitrogen oxides"; changed "pa1ts perbillion" to the defined abbreviation "ppb"; changed "micrograms per cubic meter" to "J.lg/m3"; added "measured in the air as N02" as a parenthetical offset by a comma. 243.!24(d) 50.ll(d) Changed "shall" to "must"; added "in subsections (a) through (c) ofthis Section" for enhanced clarity. 243.!24(d)(l) 50.11(d)(l) Changed "areference method" to the defined abbreviation "an FRM"; changed "this pa1t" to "40 CFR 50, incorporated byreference

... Section 243.108"; added "and designated by USEPA and listed inList ofDesignated Methods, incorporated byreference in Section 243.108."81

243.124(d)(2) 50.11(d)(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 "in List ofDesignated Methods, incorporated by reference in Section 243.108." 243.124(e) 50.ll(e) Changed "annual p1imary standard" to "1971 primary annual average NAAQS for nitrogen oxides"; added "in subsections (a) ofthis Section" for enhanced clarity; changed "thispmt" to "40 CFR 50, incorporated byreference

... Section 243.108." 243.124(f) 50.ll(f) Changed "!-hourprimary 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) 50.11 (g) Changed "secondary standard" to singular "1971 secondary annual average NAAQS for nitrogen oxides"; added "in subsection (c) ofthis Section" for enhanced clarity. 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 corresponding federal regulations. 243.125(a) 50.9 heading Changed "national !-hourprimary and secondary ambient air quality standards" to singular "1979 primary and secondary one-hourNAAQS."82

243.125(a)(l) 50.9(a) Changed "national !-hourprimary and secondary ambient air quality standards for ozone" to singular "1979 primary and secondary one-hour NAAQS for ozone"; changed "areference method" to the defined abbreviation "anFRM"; changed "thispart" to "40 CFR 50, incorporated byreference

... Section 243.108" (twice); added "by USEPA" after "and designated"; changed "in accordance with part 53 ofthis chapter" to "and listed in List ofDesignated Methods, incmporated byreference in Section 243.108"; changed "standard" to "NAAQS"; changed "parts per million" to the defined abbreviation "ppm." 243.125(a)(2) 50.9(b) Changed "!-hour standards" to singular "1997 primary and secondaryNAAQS for one-hour ozone"; changed "8-hour 

### 0 3 standards under" to "the 2008 primary and secondary eight-hour NAAQS for ozone set fmth in"; changed "the !-hourNAAQS" to "USEP A has stated that in conesponding 40 CFR 50.9(b) that the primar·y and secondary one-hourNAAQS for ozone"; added "by USEPA" after "designation ofthat area"; changed "pursuantto section I07 ofthe Clean Air Act" to "42 USC 7407" and moved it from after "8-hour ozone NAAQS" to follow "byUSEPA"; changed "standard" to "NAAQS"; changed "8-hour ozone NAAQS" to "2008 primary and secondary eight-hour NAAQS for ozone"; changed passivevoice "area designations

... are codified in 40 CFR part 81" to active-voice "USEPA has codified the area designations

... in 40 CFR 81.314." 243.125(a) Board note 50.9(b) generally, 51.905, Added explanation ofthe derivation of and 81.314 this subsection (a); added explanation of the revocation ofthe one-hour standard · and the retention in this subsection (a).83

243.125(b) 50.1 0 heading Changed "national 8-hourprimary and secondary ambient air quality standards for ozone" to singular "1997 primary and secondary eight-hourNAAQS for ozone." 243.125(b)(l) 50.10(a) Changed "level ofthe national 8-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 with part 53 of this chapter" to "and listed in List of Designated Methods, incmporated by reference in Section 243.108"; changed "parts per million (ppm)" to the defined abbreviation "ppm"; changed "8-hour" to written "eight-hour." 243.125(b)(2) 50.10(b) Changed "8-hourprimruy and secondary ozone ambient air quality standards are" to singular "1997 primruy and secondary eight-hourNAAQS for ozone is"; ; changed "8-hour" to written "eighthour"; changed "this part" to "40 CFR 50, incorporated byreference

... Section 243.108."84

243.125(b)(3) 50.10(c) Added "USEPA has stated in corresponding 40 CFR50.10(c) that"; changed "1997 ozoneNAAQS set forth 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 "USEPA designation ofthat area"; changed "pursuantto 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"; changed "1997 ozoneNAAQS" to "1997 primary and secondary eight-hourNAAQS for ozone"; changed "will continue to remain" to "will remain"; removed "the promulgation of' from after "notwithstanding"; changed "2008 ozoneNAAQS under" to "2008 primmy and secondmy eight-hourNAAQS for ozone set forth in"; added "USEPA" before "designation"; changed "the 2008 ozoneNAAQS" to "that 2008 primary and secondary eight-hourNAAQS for ozone"; moved the statement relative to codification ofarea designations into an appended Board note. 243.125(b)(3) Board 50.10(c) Changed "area designations and note classifications with respect to the 1997 NAAQS are codified" to active-voice "USEPA has codified area designations and classifications with respect to the 1997 and 2008 primary and secondary NAAQS for ozone" area moved the statement into this Board note; changed "40 CFRpart 81" to "40 CFR 81.314"; added a statement relative to future removal ofthe 1997 standards when they m·e clearly obsolete or USEPA removes them.85

243.125(b) Board note 50.!0 generally Added explanation ofthe de1ivation of this subsection (b). 243.125(c) 50.15 heading Changed "national primary and secondary ambient air quality standards for ozone" to singular "2008 primary and secondary eight-hour primary and secondary NAAQS for 

### 0 3 ." 243.125(c)(l) 50.15(a) Changed "level ofthe national 8-hour primary and secondary ambient air quality standards for ozone" to singular "2008 primmy 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 defmed abbreviation "an FRM"; 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 in List of Designated Methods, incorporated by reference in Section 243.108." 243.125(c)(2) 50.15(b) Changed "8-hourprimmy and secondary mnbient air quality standards" to singular "2008 primmy and secondary eight-hourNAAQS for ozone"; changed "3-year" to written "three-year"; changed "8-hour" to w1itten "eighthour"; changed "this pa11" to "40 CFR 50, incorporated byreference

... Section 243.108." 243.125(c) 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 withthat ofthe co!Tesponding federal regulations.86

243.126(a) 50.12 heading Changed "national prima1y and secondary ambient airquality standards" to singular "1978 primary and secondary NAAQS." 243.126(a)(l) 50.12(a) Changed "national prin1my and secondary ambient airquality standards for lead

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

... is"; changed "a reference method" to the defmed abbreviation "anFRM"; changed "this part" to "40 CFR 50, incorporated by reference

... Section 243.108"; added "and designated byUSEPA and listed in List ofDesignated Methods, incorporated byreference in Section 243.108" (twice); changed "equivalent method" to the defmed abbreviation "FEM."87

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 secondaryNAAQS for lead in subsection (b) ofthis Section" (twice); changed "lead NAAQS" 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 p1imary and secondaryNAAQS for lead set fmth in subsection (b) ofthis Section"; changed "leadNAAQS set forth inthis section" to "the 1978 primary and secondary NAAQS for lead"· chancred "the


### , 

### "' effective date of§ 50.16" to "January 12, 2009"; changed "the leadNAAQS" to "1978 primary and secondary NAAQS for lead"; changed "until that area submits, pursuant to section 191 of the CleanAir Act, and EPA approves an implementation plan" to "until USEPA has approved an implementation plan for that area pursuant to 42 USC 7415"; changed "and or"to "or." 243.125(a) Board note 50.12 generally Added explanation ofthe de1ivation of this subsection (a). 243.126(b) 50.16 heading Changed "national primary and secondary ambient air quality standards" to singular "2008 primary and secondary NAAQS."88

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 per cubic meter" to the defmed 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 "this part" to "40 CFR 50, incorporated byreference

... Section 243.108"; added "byUSEPA and listed in" after "and designated"; changed "in accordance withpart 53 ofthis chapter" to "in List ofDesignated Methods, incorporated byreference in Section 243.108." 243.126(b)(l)(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 "inList ofDesignated Methods, incorporated by reference in Section 243.108." 243.126(b)(2) 50.16(b) Changed "national primary and secondary ambient airquality standards for Pb are" to singular "the 2008 p1imary 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/mh 243.126(b) Board note 50.16 generally Added explanation ofthe derivation of this subsection (b).89

243.TableA Table I to 50.14(c) Moved the tabulated material from the body ofthe regulations into an appended table. 243.Table A heading Table I to 50.14(c) Reformatted the text from large and heading small caps to standard title text; omitted "fordata to be used in designations." 243.Table A column I Table I to 50.14(c) Omitted "pollutant" and "standard," in heading column I heading favor ofthe single entry title "NAAQS"; changed "promulgation date" to "regulatory citations"; and replaced the virgules separating entries with hard returns. 243.Table A row I Table I to 50.14(c) row I Changed "PM2.5/24-Hr standard" to column I entry column I entry "2006 24-hour PM2
.5"; separated the name ofthe NAAQS from the parenthetical level by a hard return; added citations to the Illinois and corresponding federal rules; added the FederalRegistercitation for the pertinent notice ofadopted rule. 243.Table A row I Table I to 50.14(c) row I Omitted the marking for endnote "a." column 3 entry column 3 enh·y
243.Table A row I Table I to 50.14(c) row I Omitted the marking for endnote "a." column4 entry column4 entry 243.Table A row 2 Table I to 50.14(c) row 2 Changed "ozone/8-Hr standard" to column I entry column I enh·y "2008 eight-hour ozone"; separated the name ofthe NAAQS from the parenthetical level by a hard return; added citations to the Illinois and co!Tesponding federal rules; added the FederalRegister citation for the pertinent notice ofadopted rule.
243.Table A row 2 Table I to 50.14(c) row 2 Omitted the marking for endnote "a" column 3 enh-y column 3 enh·y (twice); changed "occurs" to past-tense "occutTed"; omitted the marking for endnote "b."

### 90

243.Table A row 2 Table I to 50.14(c) row 2 Omitted the marking for endnotes "a" column 4 entry colunm 4 enl!y 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/l-hour standard" to colunm I enl!y colunm I entry "2010 one-hour nitrogen oxides (as 

### N02)"; separated the name ofthe 

### NAAQ8 from the parenthetical level by a hard return; cmrected "80-100 PPB, final level TBD)" to "(I00 ppb)"; added citations to the Illinois and corresponding federalmles; added the FederalRegistercitation for the pe11inent notice ofadopted mle. 243.Table A row 3 Table I to 50.14(c) row 3 Omitted the marking for endnote "a" colunm 3 enl!·y colunm 3 entry (three times). 243.Table A row 3 Table I to 50.14(c) row 3 Omitted the marking for endnote "a" colunm 4 entry column 4 entry (three times). 243.Table A row 4 Table I to 50.14(c) row 4 Changed 

### "802 /1-hour standard" to colunm I entry colunm I enl!y "2010 one-hour sulfur oxides (as 

### 802)"; separated the name ofthe 

### NAAQ8 from the parenthetical level by ahard return; co1rected "50-I00 PPB, final level TBD)" to "(75 ppb)"; added citations to the Illinois and corresponding federal mles; added the FederalRegister citation for the pe11inent 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 enl!·y column 3 entry (three times); changed "occurs" to pasttense "occurred"; 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" colunm 4 entry colunm 4 entry (three times); changed "occurs"to pasttense "occurred"; 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.91

243.TableA Table 1to 50.14(c), Omitted the endnote explanation of endnoteb changed effective dates since publication. 243.Table A Board Table 1 generally and Added explanation ofthe de1ivation of note note Table A; changed "EPA notes" to "USEPA noted"; added "the information in" before "this table"; changed "EPA" to "thatUSEPA"; added "USEPA stated that" before and "inthis table" after "the general schedule"; changed "usedby EPA" to "thatUSEPA will use"; added explanation ofcon·ection ofUSEPA errors 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."

Table2: Board Housekeeping Amendments

Section Source Revision(s) 243 table ofcontents, Board Changed "Preamble" to "Scope" to agree with 243.102 heading corresponding 40 C.F.R. 50.2. 243 table ofcontents, Board Added the parenthetical "(Repealed)" to accommodate 243.104 heading repeal ofthis Section, which has not 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 not direct counterpart in 40 C.F.R. 50. 243 table ofcontents, Board Changed "8-Hour Ozone" to "Ozone" to accommodate 243.122 heading consolidation ofcorresponding 40 C.F.R. 50.9, 50.10, and 50.15 into a single provision.
243 table ofcontents, Board Changed "NitrogenDioxide" to "Nitrogen Oxides 243.122 heading (Nitrogen dioxide as Indicator)" to more closely follow the heading ofconesponding40 C.F.R. 50.11.92

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, whichhas not direct counterpatt in 40 C.F.R. 50

.. 243 table ofcontents, Board Changed "Appendix" to uppercase "APPENDIX" to 243.Appendix B comport withIllinois Administrative Code codification heading requirements as asserted bythe Office ofthe Secretary of State; added theparenthetical "(Repealed)" to accommodate repeal ofthis Section, which has not direct counterpart in 40 C.F.R. 50

.. 243 table ofcontents, Board Changed "Appendix" to uppercase "APPENDIX" to 243.Appendix C compmt withIllinoisAdministrative Code codification heading requirements as asserted bythe Office ofthe Secretary of State; added the parenthetical "(Repealed)"to accommodate repeal ofthis Section, which has not direct counte1part in 40 C.F.R. 50

.. 243 authority note Board Changed "Section 10" to "Sections 7.2 and 10"; replaced the obsoleteIllinois RevisedStatutes citation with the currentIllinois CompiledStatutes citation. 243 source note Board Removed the obsolete citations "4 PCB 191" from after "R71-23" and "46 PCB 125" from after "R80-ll." 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 counte1part in 40 C.F.R. 50. 243.107 Board Removed the word "except," which does not exist inthe corresponding 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 suppmt 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 independently numbered.93

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" Board note 243.102 "USEPA, Board Added the listing ofthe document available from this National Exposure source, "ListofDesignated Reference and Equivalent Research Methods," for the purposes ofthe provisions cited in the Laboratory" entry. 243.102 "USEPA, Board Added the listing ofthe document available from this National Exposure source, "ListofDesignated Reference and Equivalent Research Methods," for the purposes ofthe provisions cited in the Laboratory" ently; added a statement that 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 the heading ofconesponding 40 C.F.R. 50.11. 243.Appendix A Board Changed "Appendix" to uppercase "APPENDIX" to heading comport withIllinoisAdministrative Code codification requirements as assetted bythe Office ofthe Secretary of State; added the parenthetical "(Repealed)" to accommodate repeal ofthis Section, which has not direct countetpatt in 40 C.F.R. 50

.. 243.Appendix A Board Repealed the obsoleterules conversion table.94

243.Appendix B Board Changed "Appendix" to uppercase "APPENDIX" to heading comport withIllinoisAdministrative Code codification requirements as asserted bythe Office ofthe Secretary of State; added the parenthetical "(Repealed)" to accommodate repeal ofthis Section, whichhas not direct counterpart in 40 C.P.R. 50

.. 243.Appendix B Board Repealed the obsoleterules conversion table. 243.Appendix C Board Changed "Appendix" to uppercase "APPENDIX" to heading comport withIllinoisAdministrative Code codification requirements as asserted bythe Office ofthe Secretary of State; added the parenthetical "(Repealed)" to accommodate repeal ofthis Section, whichhas not direct counterpmt in 40 C.P.R. 50

.. 243.Appendix C Board Repealed the obsoletepast compliance dates table.

ORDER
The Board directs the Clerk to provide notice in theIllinois Register ofthe following proposed amendments to the Illinois mnbient air quality regulations at 35 Ill. Adm. Code 243:

Section 243.101 243.102 243.103 243.104 243.105 243.106 243.107 243.108

Section 243.120 243.121 TITLE 35: ENVIRONMENTALPROTECTION SUBTITLE B: AIR POLLUTION CHAPTER I: POLLUTION CONTROLBOARD SUBCHAPTER 1: AIR QUALITY STANDARDS AND EPISODES
PART243 AIR QUALITY STANDARDS
SUBPART A: GENERALPROVISIONS
Definitions Pream8leScope Applicability Nondegradation (Repealed) Air Quality Monitming Data Influenced byExceptional Events Monitoring (Repealed) Reference Conditions Incorporations byReference
SUBPART B: STANDARDS AND MEASUREMENT METHODS
PM 10 and PM2.s Particulates (Repealed)243.122 243.123 243.124 243.125 243.126 Sulfur Oxides (Sulfur Dioxide) CarbonMonoxide 95

Nitrogen Oxides (Nitrogen Dioxide as Indicator) g Hottr Ozone Lead A]3]3eaeiK 243.APPENDIX ARule into Section Table (Repealed) A]3]3eaeiK 243.APPENDIX B Section into Rule Table (Repealed) f<]3]3eBEiiJ< 243.APPENDIX C Past Compliance Dates (Repealed) 243.TABLE A Schedule ofExceptional Event Flagging and Documentation Submission for New orRevisedNAAQS
AUTHORITY: Implementing geetioa Sections 7.2 and 10 and authorized by Section 27 ofthe Environmental Protection Act (Ill. Rev. gtat. 1991, ea. Ill 112, J3ars. 1010 aae 1027) [415 ILCS 517.2, 10, and 27].
SOURCE: Adopted as Chapter 2: Air Pollution, Part III: Air Quality Standards, in R71-23,-4 PCB 191, filed and effective Apiill4, 1972; amended in R80-ll, 46 PCB 125, at 6 Ill. Reg. 5804, effective April22, 1982; amended in R82-l2, at 7 Ill. Reg. 9906, effective August 18, 1983; codified at 7 Ill. Reg. 13630; amended in R91-35 at 16 Ill. Reg. 8185, effective May 15, 1992; amended in R09-19 at 35 Ill. Reg. 18857, effective October 25, 2011; amended in Rl3-ll at 37 Ill. Reg. , effective

_________ _ SUBPART A: GENERAL PROVISIONS Section 243.101 Definitions a) EKeept as stateEl in this Part aaEl Bnless a Elif:fere!Tt meaain:g efaterm is elear H·effi its eoflleKt, !fle eefmitioas oftem1s usee inthis Part saallbe !fle same as !flose HseEI iatfle BavireBrBefllal Proteetioa Aet [415 ILCg 5] (Aet). b) All terms taat a]3]3ear iathis Part aave tae Elefmitioas Sfleeifiee by 35 Ill. ,\Elm. Coee 201 or 211.
Forthe purposes ofthis Part. te1ms listed below will have the meanings attributed to them in this Section. Asused in this Part, all terms not defmed in this Section will have the meaning given them bythe Act: the CAA, incorporated 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 Enviromnental Protection Agency.
"Ambient air" means that portion ofthe atmosphere. external to buildings. to which the general public has access.

### 96

"CleanAir Act" or "CAA'' means the federal Clean AirAct 42 USC 7401 et. seq, as amended, incmporatedbyreference in Section 243.108.
"Exceedance ofa NAAQS" means one occunence ofa measured or modeled concentration that exceeds the specified concentration level ofsuch standard for the averaging period specified bythe standard. "Exceptional event" means an event that fulfills all ofthe following criteria:
The event affects air quality;
The event is not reasonably controllable orpreventable;
The event is an event caused by human activitythat is unlikelyto recur at a particular location or a natural event; and
The event is detetmined byUSEPA in accordance with 40 CFR 50.14 to be an exceptional event.
An "exceptional event" does not include any ofthe following: Stagnation ofairmasses ormeteorological inversions:
A meteorological event involving high temperatures or lack of precipitation; or Airpollution relating to source noncompliance.
"Federal equivalent method" or "FEM" means a method for measuring the concentration ofan air pollutant inthe ambient air that USEPA has designated as an equivalent methodpursuant to 40 CFR 53 and which is included inList of Designated Methods. including laterupdates. as incmporated 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 or53.16. as reflected in the incmporation by reference in Section 243.108. BOARD NOTE: Derived from 40 CFR 50.1Cf) (defmition of"equivalent method"), 50.11Cd)(2) (parenthetical definition of"FEM"), and 53.1 (definition of "federal equivalent method"). The clause "including later updates" in this definition is intended 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 incomorated byreference in Section 243.108. A federal designation ofan FEM becomes effective uponpublication ofa notice in the Federal Register. A federal cancellation ofan FEMbecomes effective upon deletion from the listing ofFEMs orfrom an appendix to 40 CFR 50.97

"Federal reference method" or "FRM" means a method ofsampling and analyzing the ambient air for an air pollutant that USEPA has specified as a reference method in an appendix to 40 CFR 50, incorporated 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.I08; 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 in the incmporation byreference in Section 243.108. BOARD NOTE: Derived from 40 CFR 50. I (f) (defmition of"reference method") and 53.1 (defmition 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 byreference in Section 243.108. A federal designation ofan FRMbecomes effective uponpublication of a notice in the Federal Register. A federal cancellation ofan FRMbecomes effective upon deletion from the listing ofFRMs or fi·om an appendix to 40 CFR 50. "Micrograms per cubic meter" or "ug/m3" means one millionth (I0'6) ofa gram of a contaminant per cubic meter ofambient air, as measured and determined by the methods prescribed for that contaminant. BOARD NOTE: The Board added this definition and that for "milligrams per liter" Cin1mediately below). "Milligrams per cubic meter" or "mg/m3" means one thousandth (I0'3) ofa gram ofa contaminant percubic meter ofambient air, as measured and determined by the methods prescribed for that contaminant.
"National Ambient Air Quality Standard" or "NAAOS" means a standard established byUSEPA that applies for outdoor air throughout the United States. BOARD NOTE: The Board added this definition, derived from the definition in "Terms ofEnviromnent: Glossary, Abbreviations, and Acronvms" (December 1997), EPA 175-B-97-001. at 30. USEPA has codified the NAAOS at 40 CFR 50. BOARD NOTE: The Board added this definition based on the definition in "Terms ofEnviromnent: Glossary. Abbreviations, and Acronyms" (December 1997), document number EPA 175-B-97-001, USEPA. Office of Communications, Education, and Public Affairs, at 30.
"Natural event" means an event in which human activity plays little or no direct causal role.

### 98

"Parts perbillion" or "ppb"means the ratio ofthe pm1s ofa specified contaminant to a billionpat1s ofair byweight (I:I

## o-9). as measured and determined bythe methods prescribed for that contaminant. BOARD NOTE: The Board added this definition and that for "pm1s per million" (immediately below). derived from the parentheticals in 40 CFR 50.4(a) and (b) and 50.17(a) and the definition of"parts perbillion (ppbl/parts per million (ppm)" in "Terms ofEnvironment: Glossary. Abbreviations. and Acronyms" (December 1997). EPA 175-B-97-001. at 34.
"Parts per million" or "ppm'' means the ratio ofthe pm1s ofa specified contaminant to a million p3!1s ofairbyweight (I:I0'6). as measured and detennined bythe methods prescribed for that contaminant. BOARD NOTE: The Board added this definition and that for "parts permillion" (immediately below). derived from the parentheticals in40 CFR 50.4(a) and (b) and 50.17(a) and the definition of"pm1s perbillion (ppbl/parts per million (ppm)" in "Tetms ofEnvironment: Glossary. Abbreviations. and Acronyms" (December 1997). EPA 175-B-97-001. at 34.
"PM 10" means pm1iculate matterthat has an aerodvnamic diameter less than or egual to a nominal I0 micrometers (l!m). BOARD NOTE: The Board added this definition. derived from the parenthetical definition in40 CFR 50.6(c). "PM, 5 " means p3!1iculate matterthat has an aerodvnamic-diameter less than or egual to a nominal 2.5 micrometers (l!m). BOARD NOTE: The Board added this definition. derived from the parenthetical definition in40 CFR 50.7(a).
"Traceable" means that a local standard has been compared and cet1ified either directly orvia not more than one intetmediate standard, to aprimary standard, such as a National Bureau ofStandards Standard Reference Material (NBS SRMl. or a USEPA/NBS-approved Certified Reference Material CCRMl.
"USEPA" means the United States Environmental Protection Agency. BOARD NOTE: Detived from 40 CFR 50.1Ccl. The Board has used "USEPA" in segments oftext where USEPA has used "Administrator." where action by USEPA is clearly contemplated. Othetwise. the Board has retained the term "Agency" as defined inthis Section.
BOARD NOTE: Derived from 40 C.P.R. 50.1 (2012). except as otherwise more specifically indicated. (Source: Amended at 37 Ill. Reg.

____ ,, effective----------'99



### Section 243.102 Preamble Scope a) Air Ejt!alit)· staadards are lrn1its ea atmespherie eeaeeffiratieas efair eeffiamrnaffis estalJiished fer the pt>fj3ese efpreteetiagJlOOiie health aad welfare. The le'<els ef air Ejt!ality desigaated lJy the staadards are desigaed te JlFeleet agarnst injury te ffilmaa, Jllaffi er aaimallife aad they <n·e further iffieaded te allow maKimum SRjeymeffi eflife aad JlreJlel1y eeasisteal v1ith the iffieffi efthe Aet. 

### a) This Pat1 sets forth the NAAQS adopted byUSEPA under section 109 

### ofthe CAA (42 

### USC 7409) 

### and incorporated into this Patt pursuant to 415 

### ILCS 5/7.2 

### and lOCH). 13) The first use efour air reseurees is to sestaia life. Afr effierrng the respiratory !rae! must aot meaaee health. Therefore, the air EJ:Hality staadards set mtiS!, as a minimHm, provide air whieh v1ill aet adversely affeet, through aStile er ehrenie S)'H'ljlloms, the health ofthe eeHlffil>nity. A&verse health effeets iaelude aet oaly the possilJie prodtietioa aad aggnwatiea ofdisease, lJut also iffierfereaee with lJedily fuRetieas. The staadards ha-ve also takea iffie aeeetiffi seilrng, eerresiea, vegetatioa damage aad etherlmmaa effeets. 

### b) National mimary ambient air quality standards (primaryNAAQS) define levels of air quality thatUSEPA has judged are necessaty. with an adequate margin of safety. to protectthe public health. National secondary ambient air qualitv standards (secondaryNAAQS) define levels ofair qualitv that USEPA has judged necessary to protect the public welfare from any known or anticipated adverse effects ofapollutant. Such standards are subject to revision. and additional primary and secondaryNAAQS maybe promulgated as USEPA deems necessaty to protect the public health and welfare. e) Prllilary amlJieffi air EJ:tiality staad<n·ds defiae levels ofair Ejt!ality whieh are aeeessary, with aa adeEjt!ate a1argia efsafet)·, to proteet the JlOOiie health. Seeoadary aRlllieffi air Ejt!ality slafldards defiae levels ofair Ejt!ality whieh are aeeessaryto preteet the JlOOiie welfare fwm any knovlfl or affiieijlated ad-verse effeets ofa JlOihilffilt. 

### c) The promulgation ofprimaty and secondaryNAAQS must not be considered in any manner to allow significant deterioration ofexisting air quality in any pmtion ofthis State. d) The staadards are mere thaa goals. They are legally SRfereealJie limitatioas, aad aeyJlersea eat>sing or eomrilJutrng to a violatioa efthe stafldards is soojeet to enfereemeffiJlroeeediags uaderthe Aet The s!E!l'ldards have also lJeea desigaed fer use as a lJasis fer the developmeffi ofiffijllemeffiatioa plaas lJy State aad loeal ageaeies fer the alJatemSR! aad eeffirel ofpollutaat emissieas from eJlistiag seurees, aad ferthe determiaatiea ofair eoffiamiaaffi emissiealimitatieas to100

iflSHFe teat flBflHlatiefl aaa e68fl8HH6 grewtetreflaS ae fl8t aaate tee regiea's air flBll!itiea flFealems.
BOARD NOTE: Derived from 40 CFR 50.2 (2012). (Source: Amended at 37 Ill. Reg.

___ , effective

_________ _J Section 243.103 Applicability
The standards inthis Pmt are**~!llieaale** ;mlliy_throughout the State ofIllinois, except as othetwiseprovided in this Part. (Source: Amended at 37 Ill. Reg.

____ , effective-----------' Section 243.104 Nondegradation (Repealed) El<istiag amaiefll air EJ:aality teat is setterteaatee estaaliseea amaieat air EJ:Hality staaaaras at tee Elate efteeir aEie!3tiea will ae maifllaiaea iaits flFeseflt ftige EJ:Hality. Saee aaal3iefll air EJ:!iality seall Ret ae lewereaHH!ess aaa Hfllil it is fli'SYea te tee lilffieis Ew:ireamefltal PreteetieaAgeaey (Ageae)0 teat tee eeaage isjastifiaale as a resalt efaeeessary eeeaemie aaa seeial aeYele!lmeflt aaa will aet imerfere wite ereeeeme iajarieas te eamaaeealte erwelfare. (Source: Repealed at 37 Ill. Reg.

____ , effective-----------' Section 243.105 Air Qualitv Monitoring Data Influenced bv Exceptional Events a) Requirements. ]) The Agencymayrequest USEPA to exclude from use indetenninations data showing an exceedance ofan NAAQS that is directly due to an exceptional event. The Agency must demonstrate to USEPA that such event caused a specific airpollution concentration at a pmticular air qualitvmonitoring location. 2) A demonstration to justify data exclusion may include any reliable and accurate data. but must demonstrate a clear causal relationship between the measured exceedance ofan NAAQS and the event in accordance with paragraph ( c)(3)(D) ofthis section. b) DetetminationsbyUSEPA. USEPA has stated the criteria for making a detennination to exclude data as follow: I) Exceptional events. USEPA has stated that it will exclude data from use in detetminations ofexceedance ofan NAAQS where the Agencyhas demonstrated that an exceptional event caused a specific airpollution concentration in excess ofone or moreNAAQS at aparticular air quality101
monitoring location. and the Agency othe1wise satisfies the requirements of40 CFR 50.14. 2) Fireworks displays. USEPA has stated that it will exclude data from use in determinations ofexceedance ofan NAAQS where the Agency has demonstrated that emissions from fireworks displays caused a specific air pollution concenh·ation inexcess ofone or more NAAQS at apmiicular air quality monitoring location. and the state otherwise satisfies the requirements of40 CFR 50.14. USEPA has stated that such data will be treated in the same manner as exceptional events under this rule. provided the Agency has demonstrated that suchuse offireworks is significantly integral to traditional national, ethnic. or other cultural events. including. but not limited to JulyFourth celebrations. which satisfythe requirements of40 CFR50.14. 3) Prescribed fires. USEPA has stated that it will exclude data from use in detenninations ofexceedance ofan NAAQS where the Agency has demonsh·ated that emissions from prescribed fires caused a specific air pollution concentration in excess ofone or more NAAQS at a pmiicular air qualitymonitoring location. and the Agency otherwise satisfies the requirements of40 CFR 50.14. provided that such emissions are fi·om prescribed fires that USEPA determines meets the defmition of "exceptional event'' in Section 243.101, and provided that the Agency has ce1iified to USEPA that the State has adopted and is implementing a SmokeManagement Program CSMP) orthe state has ensured that the bumer employed basic smoke managementpractices. Ifan exceptional event occurs using the basic smoke management practices approach, the Agency mustundertake a review ofthe State's approach to ensure public health is being protected and must include consideration ofdevelopment ofa SMP.
BOARD NOTE: Ineach ofcoJTesponding 40 CFR 50.14(b)Cll. (b)(2) and Cb)(3). USEPA stated "EPA shall exclude data from use in detenninations of exceedances and NAAQS violations." Inthe first person, "shall" is used more to express present intent or to commit to future action. The Board has changed "EPA shall" to "USEPA has stated that it will." Fmiher. the Board has relied on the defined term "exceedance ofan NAAQS." c) Schedules and Procedures. ]) Public notification. The Agency or. where the Agency has delegated authoritypursuant to Section4(g) or (r) ofthe Act [ 415 ILCS 5/4(g) or (r)J. the Agency's delegatee. must notify the public promptly whenever an event occurs or is reasonably anticipated to occurwhich may result in the exceedance ofan NAAQS.102
2) Flagging ofdata. A) The Agencymust notify USEPA ofthe State's intent to exclude one or more measured exceedance ofan NAAQS as being due to an exceptional event byplacing a flag in the appromiate field for the data record ofconcern that has been submitted to the federal air guality system CAQS) database. B) Flags placed on data in accordance with this Section must be deemed infmmational only, and the data must not be excluded from dete1minations with respect to an exceedance ofan NAAQS unless and until after USEPA notifies the Agency ofUSEPA concurrence following the Agency's submittal ofa demonstration pursuant to subsection ( c)(3) ofthis Sectionbyplacing a concurrence flag inthe appropriate field for the data record in the AQS database. 

### Cl 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 thanJuly 1st ofthe 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) corresponds with 40 CFR 50.14(c)(2)(iv), which has expired byits own te1ms. This statement maintains stmctural consistency with the federal regulations. E) This subsection (c)(2)(E) corresponds with 40 CFR 50.14(c)(2)(v). which has expired by its own terms. This statement maintains stmctural consistencywith the federal regulations. F) USEPA has stated that when USEPA sets aNAAQS for a new pollutant orrevises theNAAQS for an existing pollutant. USEPA mayrevise or set a new schedule for flagging exceptional event data. providing initial data descriptions. and providing detailed data documentation in AQS for the initial designations ofareas for those NAAQS. Table A to this Part 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 itwill revise the table upon which Table A to this Part is based as necessary to accommodate revised data submission schedules for new orrevised NAAQS. 3) Submission ofdemonstrations.103

A) When the Agency has flagged data as being due to an exceptional event and is requesting exclusion ofthe affected measurement data, tbe Agencymust, after notice and opportunitv for public comment submit a demonstration to USEPA to justify data exclusion not laterthan the sooner ofthree years following the end ofthe calendar quarter in which the flagged concentration was recorded or 12 months prior to the date that a regulatmy decision must bemade byUSEPA. The Agencymust submit the public comments it received along with its demonstration to USEP

### A B) This subsection (c)(3)(B) corr-esponds witb 40 CFR 50.14(b)(3)(ii). whichpertains only to a repmting period and opportunity to demonstrate exceptions that has passed. This statement maintains stmctmal consistencywith the federal regulations. C) This subsection (c)(3)(B) corr-esponds with 40 CFR 50.14(b)(3)(ii), which pertains onlyto a reporting period and opportunityto demonstrate exceptional events tbat 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 forth in Section 243.101: ii) That there is a clear causal relationship between the measurement under consideration and the event that is claimed to have affected the air quality intbe area; iii) That the event is associated with a measured concentration in excess ofnormal 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, tbe Agencymust document that the public comment process was followed.
BOARD NOTE: Derived from 40 CFR 50.14 (2012). (Source: Added at 3 7 Ill. Reg.

___ , effective

_________ ....J104

Section 243.106 Monitoring (Repealed)
Pellatiealevels wi1113e detenniaed 13y HJted erme13ile sam)'lliag statieas 13eyead the )'lremises ea whieh a searee is !seated. Statieas 'Nill13e leeated aeeerdiag te the gaildeliaes fer esta13lished FHonitorffig aeRveFks as Elevelef)eEl By tHe UHited States EITviroflffieFrtal ProteetioR PrgeBey. (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, eJWe)'lt other than for particulate matter (PM2
.5) standards contained in Section 243.120(b) and (c) and lead standards contained in Section 243.126(b), are corr-ected to a reference temperature of25°_C, and to a reference pressure of760 millimeters ofmercury (1013.2 millibars). Measurements ofPM 25, for pwposes ofcomparison to the standards contained in Section 243.120(b) and (eLand lead, measmemeats shall for purooses of comparison to the standards contained in Section 243.126(b). must be reported based upon the actual ambient airvolume measured at the actual temperature and pressure at the monitoring site during the measurement period.
BOARDNOTE: Derived from 40 CFR 50.3 (2012). (Source: Amended at 37 Ill. Reg.

____, effective

_________ _, Section 243.108 Incorporations byReference
The following materials are incorporated byreference. These incorporations do not include any later amendments or editions: a) Pararesaniliaemethed, 

### 4Q CFR 

### §Q, a)'l)'leadiJt A 

### (19S2). 13) Nea dis)'lersive iaftared SJ3eetrea1etry teehniEjlle, 

### 4Q CFR 

### §Q, a)'lfleRdiK C 

### (19S2), 39 Fed. Reg. 

### 22391, l>levem13er 

### 2§, 1971. e) Celerimetriemethed, 

### 39 Fed. Reg. 

### 22399, Nevem13er 

### 2§, 1971. d) O;;mae**etflj~eae** reaetiea methed, 

### 4 QCFR 

### §Q, a)'l)'leadiJt D 

### (1982), 39 Fed. Reg. 

### 22392, l>le,·era13er 

### 2§, 1971. e) Lead, 

### 4Q CFR 

### §Q, a)'lfleRdiK G 

### (2QQ8). f) Refereaee methed fer the detenniaatiea ef)'lartiealate matter as**P~'!.w-ffi...the** atmes)'lhere, 

### 4Q CFR 

### §Q, a)'lfleRdiJt 

### J (199Q).105
g) latefJ3retatieR sftf!e JllatieRal AmeieRt Air**Qt~ality** gtaRaaFEls (JIL'.AQg) fer**]3artiet~late** matter, 40 CPR 

### 50, 6J3J3eRaiK K, 73 Pea. Reg. 61144 (Oeteeer 17,**~** h) RefereRee metl!ea fer the aeteFFRinatieR efJ3ar!ielilate matter as PM""'-ffi...the atmesJ3l!ere, 40 CPR 

### 50, 6J3J3eRaiK L, 73 Pea. Reg. 6114 4 (Oeteeer 17, 2006). i) lffiefjlretatieR eftl!eJIIAAQg fer 

### PM-M, 40 CPR 

### 50, 6J3J3eRaiK Jll, 73 Pea. Reg. 

### 1497 (Jaooal)· 9, 200g). j) lffiefjlretatieR eftl!eJIIAAQS fer**0~,** 40 CPR 

### 50, aJ3J3eRaiK P, 73 Fee. Reg. 16436 (Marel! 27, 200g). k) The Jll-Af,Qg fer Leaa; FiRal Rule, 40 CFR 

### 50, 51, 53, aRe 5g, 73 Fea. Reg. 66964 (JIIevember 12, 200g). I) laterJ3retatieR eftl!eJIIAAQS fer Leaa, 40 CFR 

### 50, 6J3J3eRaill R, 73 Fee. Reg. 66964 (JIIevemeer 12, 200g).
Govemment 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 incorporated byreference are available from this source: Appendix A-1 to 40 CFR 50 (2012) (ReferenceMeasurement Principle and Calibration Procedure 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 the Atmosphere (Pararosaniline Method)). referenced in Section 243.122. Appendix B to 40 CFR 50 (2012) (Reference Method for the Determination ofSuspendedPmticulate Matterin the Atmosphere (HighVolume Method)). referenced in appendix G to 40 CFR 50 (see below). Appendix C to 40 CFR 50 (2012) (Reference MeasurementPrinciple and Calibration Procedure for the Measurement ofCarbon Monoxide in the Atmosphere (Non-Dispersive Infrared Photometry)). referenced in Section 243.123. Appendix D to 40 CFR 50 (2012) (Reference MeasurementPrinciple and Calibration Procedure for the Measurement ofOzone in the Atmosphere). referenced in Section 243.125.106
Appendix F to 40 CFR 50 (2012) (Reference Measurement Principle and Calibration Procedure for the Measurement ofNitrogen Dioxide inthe Atmosphere (Gas Phase Chemiluminescence)). referenced in Section 243.124. Appendix G to 40 CFR 50 (2012) (Reference Method for the Dete1mination ofLead in Suspended Pm1iculate Matter Collected from Ambient Air). referenced in Section 243.126. Appendix H to 40 CFR50 (2012) (Interpretation ofthe !-HourPlimary and SecondaryNational Ambient Air Quality Standards for Ozone). referenced in Section 243.125. Appendix I to 40 CFR 50 (2012) (Interpretation ofthe 8-Hour Plimary and SecondawNational Ambient Air Quality Standards for Ozone). referenced in 243.125. Appendix 

### J to 40 CFR 50 (2012) (Reference Method for the Determination ofPm1iculate Matter as PM10 in the Atmosphere. referenced in Section 243.120. Appendix K to 40 CFR 50 (2012) (Interpretation ofthe P1imary and Secondary National Ambient Air Quality Standards for Particulate Matter), referenced in Section 243.120. Appendix L to 40 CFR 50 (2012) (Reference Method for the Dete1mination ofFine Particulate Matter as PM,.s in the Atmosphere). referenced in Section 243.120. Appendix N to 40 CFR 50 (2012) (Interpretation ofthe Primary and Secondary National Ambient Air Quality Standards for Pa11iculate Matter), referenced in Section 243.120. Appendix 

### 0 to 40 CFR50 (2012) (Reference Method for the Determination ofCoarse Particulate Matter as PM10.2.5 in the Atmosphere). referenced in appendix 

### 0 to 40 CFR50 and for use in federally required monitming bythe NCore system pursuant to 40 CFR**~** Appendix P to 40 CFR 50 (2012) (Interpretation ofthe Primary and Secondmy National Ambient Air Quality Standards for Ozone). referenced in 243.125. Appendix 

### 0 to 40 CFR 50 (2012) (Reference Method for the Dete1mination ofLead in Pm1iculate Matter as PM10 Collected from Ambient Air). referenced in appendix R to 40 CFR 50.107

Appendix R to 40 CFR50 (2012) Cintemretation ofthe National Ambient Air Quality Standards for Lead), referenced in Section 243.126. Appendix S to 40 CFR 50 (2012) (Intemretation ofthe P1imary National AmbientAir Quality Standards for Oxides ofNitrogen (Nitrogen Dioxide)), referenced in 243.124. Appendix T to 40 CFR58 (2012) Clntemretation ofthe PrimmyNational Ambient Air Quality Standards for Oxides ofSulfur (Sulfur Dioxide)), referenced in Section 243.122.
CleanAir Act. 42 USC 7401 et seq. (2011) (for definitions ofterms only), referenced in Section 243.102.
BOARDNOTE: 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 Laboratory, HumanExposure & Atmospheric Sciences Division (MD-D205-03), Research Triangle Park, NC 27711. The following documents incomoratedbyreference are available from this source: "ListofDesignated Reference and Equivalent Methods" (December 17, 2012) (referred to as "ListofDesignated Methods" and referenced in Sections 243.101,243.120,243.122,243.123.243.124,243.125, and 243.126. This reference includes the no Federal Registernotices subsequent to December 17.2012that updated List ofDesignated Methods.
BOARDNOTE: This document is available for free download as a PDF document fi·om 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 PMw and PM2.5 

### a) Staaaanls. The J3rimary aaa seeeaaary alfll3iea! air EIUali!y staaaarEls fer PMw.are a maJlilffilm 24 heur a-verage eeaeeffiratiea ef 15Q**t±§'m~.** The s!aaaaras are a!!aiaea v;hea the e)(J3ee!ea ooml3er efaays J3er ealeaaar yearv:ilh a 24 heHr108
&verage eeHeel'ltratieH ae8':e l§Q**flg/m~** is efjual te erless taaH eHe, as measurea aHa aetermiHea iH aeeeraaHee with sullseetieH (e). e) Measuremeflt Metaea. fer aetermffiiHg eeHfermaHee wita tl!e PM

..w.amlliel'lt air EjUality staHaaras, PMw saall eemeasurea eytae metaea aeserieea iR 4Q CPR §Q, aJ3J'18flaiK J er aH efjuivalel'lt metaea aesigHatea J9HrsuaHt te 4Q CPR §3 (iReerJ9eratea eyrefureHee iH SeetieH243.1Q8). Tae staHaaras are attaiHea ·.vaeH tl!e eJ'fleetea flllmSer efaays J9er ealeHaar yearwita a 24 aeur il':erage eeHeeHtratioH aeo1·e 15Q flg/nl is efjual te orless tflaH oHe, as aetermiRea iH aeeeraaHee 'Nita 4Q CPR 5Q, af1f1eHaiK K (iHeerJ9eratea eyrefureHee iR SeetieH 243.1Q8). e) !i:taHaaras. Thej'lrimary aHa seeeHaary ameieHt air Ejllality staHaaras fur**P~.<[g**aFei1) AH al1ffi!al aritl!metie meaH eeHeeHtratieH ef 15.Q**flg,'m~** aHa as measurea aHa aetermiHea iH eeHfurmaHee wita sueseetieH (a). 2) f, maKiroum 24 aGUf 69f!Sel'ltratiefl ef35 flg,lm", at tfle gg!fl j'lereeHtile value, aHa as measurea aHa aetermiHea iR eeflfermaHee wit!! sullseetieH 

## Wo a) MeasHremel'lt Metaea fer PJ>.<Ig. fer aetenniRiHg eeHfurmaHee wita the PJ>.<[g amlliel'lt air Ejllality staHaaras, PJ>.<[g saall eemeasHrea eytae metaea aeserieea iH 4Q CPR 5Q, aJ3f1eHaiK L er aH efjll¥:alel'lt metaea aesigHatea J'lliFSli&at te 4Q CPR 53 (iReefj'lGFatea eyrefereHee iR SeetieH243.1Q8). Cemj'lliaHee with tl!e staHaaras is aetermiReaHsiHg tae metaeas aHa J9reeeaHres aeserieea iH 4Q CPR 5Q, ajlj'leHaiK 

### 1'! (ifl69Fj'19fatea eyrefureHee ifl Seetiefl 243.IQ8). I) The al1ffi!al j'lriroary aHa seeoHaary PJ>.<[g staHaaras are met ·.vaeH tae 

### annual arithrnetie fFleaH eeaeeatFatieH, 

### as EletenRffieS. ia aeeerElaHee with 4Q CPR5Q, aj'lj'18flaiK 

### Jl!, is less taaH er efjllal te 15.Q**flghn~"** 2) The 24 aeHrj'lrimary aHa seeeHaary PJ>.<[g staHaaras are met waeH tae 98thj'lereel'ltile 24 aelir eeHeel'ltratieH, as aetermiHea iH aeeeraaHee ·.vita 4Q CPR5Q, ajlj'leHaiJt 

### 1'!, is less taaH or efjllal to 35 flg,lm"" a) 1987 primary and secondary 24-hour NAAQS for PM 10. 1) The level ofthe 1987 primary and secondary24-hourNAAQS for PM 10 is 150 ug/m3• 24-hour average concentration. The 1987 primary and secondary NAAQS for PM 10 is attained when the expected number of days per calendar year with a 24-hour average concentration above 150 ug/m3• as dete1mined in accordance with appendix K to 40 CPR 50. incorporated byreference in Section 243.108. is equal to or less than one.109
2) This subsection (a)(2) co!Tesponds with 40 CFR51.6(b), aprovision marked "reserved"byUSEPA. This statement maintains stmctural consistency withthe conesponding federal regulation. 3) Forthe putpose ofdetermining attainment ofthe 1987 primary and secondary 24-hourNAAOS for PM 10, pmticulate matter mustbe measured in the ambient air as PM 10 bya method that fulfills either ofthe following requirements: A) AnFRMbased on appendix 

### J to 40 CFR 50, incorporated byreference in Section 243.108. and designated byUSEPA and listed in List ofDesignated Methods, incmporated by reference in Section 243.108, or B) AnFEM designated byUSEPA and listed in List ofDesignated Methods, incorporated byreference in Section 243.108.
BOARD NOTE: This subsection (a) is derived from 40 CFR 50.6 (2012). USEPA adopted 1997 primaryNAAOS for PM 10 at 62 Fed. Reg. 38652 (July 18, 1997). As a result ofajudicial vacatur, USEPA laterremoved the transitional provision relative to the 1987 NAAOS at 65 Fed. Reg. 80776 (Dec. 22, 1 000) and the 1997 NAAOS at 69 Fed. Reg. 45595 (July 30, 2004). Thus, the 1987 primarv and secondaryNAAOS for PM 10 are included in this subsection (a). b) 1997 primary and secondary annual average and 24-hourNAAOS for PM,.s.
1) The 1997 mimary and secondary annual average NAAOS for PMz.s is 15.0 ug/m3

, annual arithmetic mean concentration. and the 1997 primary and secondary 24-hourNAAOS for PMz.s is 65 ug/m3• 24-hour average concentration, measured in the ambient air as PM2
.5by a method that fulfills either ofthe following requirements: A) An FRM based on appendix L of40 CFR50. incorporated by reference in Section 243.108 and designated byUSEPA and listed in List ofDesignated Methods, incorporated byreference in Section 243.108: or B) AnFEMdesignated byUSEPA and listed inList ofDesignated Methods, incmporated byreference in Section 243.108. 2) The 1997 primary and secondary annual average NAAOS for PMz sis met when the annual arithmetic mean concentration, as dete1mined in accordance with appendix N of40 CFR 50, incorporated byreference in Section 243.108, is less than or equal to 15.0 ug/m3•110
3) The 1997 primary and secondary 24-hourNAAOS for PM15 is met when the 98thpercentile 24-hour concentration. as dete1mined in accordance with appendix N of40 CFR50. incorporated byreference in Section 243.108. is less than oregual to 65 ug/m3

. BOARDNOTE: This subsection (b) is derived from 40 CFR50.7 (2012). The 2006 primary and secondmy annual average and 24-hourNAAOS for PM ,,5 differs from the 1997 standards in that the 24-hour average concentrationrequired bythe 2006 standard is substantially lower (more stringent) than that for the 1997 standard. The Board has retained the 1997 standard in this subsection Cb) because USEPA has retained the 1997 standard in40 CFR 50.6. c) 2006 primary and secondary annual average and 24-hourNAAOS for PM:u:.
1) The 2006 primary and secondary annual averageNAAOS for PM, 5 is 15.0 11g/m3• annual arithmetic mean concentration. and the 2006 primary and secondary 24-hourNAAOS for PM, 5 is 35 ug/m3• 24-hour average concentration. measured in the ambient air as PM,. 5 by a method that fulfills either ofthe following requirements: A) An FRM based on appendix L of40 CFR50. incorporated by reference in Section 243.108 and designated byUSEPA and listed in List ofDesignated Methods. incorporated byreference in Section 243.108: or B) AnFEM designated byUSEPA and listed in List ofDesignated Methods. incorporated byreference in Section 243.108. 2) The 2006 primary and secondary annual averageNAAOS for PM,.s is met when the annual arithmetic mean concentration. as determined in accordance with appendix N of40 CFR 50. incorporated byreference in Section 243.108. is less than or equal to 15.0 ug/m3 3) The 2006 primary and secondary 24-hourNAAOS for PM, 5 is met when the 98th percentile 24-hour concentration, as detennined in accordance with appendix N of40 CFR50. inc01porated byreference in Section 243.108. is less than orequal to 35 ug/m3

. BOARD 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 StanEiarEis. Taej3Fimary ambient air E!Hality stanEiarEis fer salfur eKiEies measareEI as salrur ElimliEie are:Ill



### I) AR allllilal aritl!metie H!eaR eeReeR!ratieR ef

### go flg/H!" (0.03 J3J3H1); ana, 2) A H!aKiFRHHI 24 heur eeaeeR!ratiea, nette Be eKeeeEieEI H!ere than eRee 13eryear, ef3a5 Ftgi.nl(O.l4 

### J3J3H!). B) SeeenEiary StanEiarEI. The seeeREiary aH!BieRt air EjUa!ity staREiarEI fer sulfur eKiEies H!easHFeEI as sulfur ElimciEie is a H!aKirauH! 3 heur eeReeR!ratieR net te Be eJceeeEieEI H!ere thaR ease 13er year ef 1,300**Fl§ H!~**  

### (0.5 J3J3H!). e) MeasuremeRI MetheEI. FerEleterH!iffiRg eeRfernlaRee with sulfur eJciEie air Ejllality staREiarEis, sulfur eKiEies shall Be H!easureEI as sulfur ElieJciEie BY the J3araresaniliae H!etheEI EleseriBeEI iR 

### 4 0 CFR 50, apJ3enEiiK A, (iaeerJ3emteEI BY refereaee iR SeetieR 24 3.I

### og), erB)' aR eEjllivaleat H!etheEI efJ3reefaJ3J3re'<'eEI B)' the AgeRey. a) 1971 primary annual average and 24-hourNAAOS for sulfur oxides (as sulfur dioxide CSOz)).
1) The level ofthe 1971 primmy annual averageNAAQS for sulfur oxides is 0.030 ppm. not to be exceeded in a calendar year. The annual a1ithmetic mean mustberounded to three decimal places (fractional pm1s equal to or greater than 0.0005 ppmmustberounded up). 2) The level ofthe 1971 primary 24-hourNAAQS for sulfur oxides is 0.14 ppm. not to be exceeded more than once per calendar year. The 24-hour averages must be determined from successive non-overlapping 24-hour blocks stat1ing at midnight each calendar day and must be rounded to two decimal places (fractional parts equal to or greater than 0.005 ppm mustbe 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. or by an FEM designated byUSEPA and listed in List of Designated Methods. incorporated byreference in Section 243.108. 4) To demonstrate attainment. the annual arithmetic mean and the secondhighest 24-hour averages must be based uponhourly data that m·e at least 75 percent complete in each calendar quarter. A 24-hour block average must be considered valid ifat least 75 percent ofthe hourly averages for the 24-hour period are available. Inthe event that only 18-. 19-.20-.21-. 22-. or 23-hour averages are available, the 24-hourblock average mustbe 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. butthe 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. then this mustbe considered a valid112

24-hour average. In this case, the 24-hour block average must be computed as the sum ofthe available hourly averages divided by24. 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 primmy one-hourNAAQS for sulfur oxides in subsection (c) ofthis Section. TheBoard will delete the 1971 primm-y annual average and 24-hourNAAQS for sulfur oxides set fmih in this subsection (a) after fulfillment ofthe conditions recited by USEPA in corresponding 40 CFR 50.4(e).
BOARD NOTE: Co!Tesponding 40 CFR 50.4(e) recites that the 1971 primaryNAAQS for sulfur oxides remains effective 

### in two tvpes ofareas for which USEPA has not yet approved an implementation plan 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-hour NAAQS for the 1971 mimmyNAAQS 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, USEPA had not designated any area in Illinois as non-attainn1ent. See 40 CFR 81.314 (201 0). The Board is unaware ofany USEPA SIP call for any area ofIllinois relative to the 1971 mimaryNAAOS for sulfur oxides. As ofDecember 31, 2012. USEPA had not yet designated the attainment status ofareas inIllinois. See 40 CFR 81.314 (2012). TheAgency recommended thatUSEPA designate limited areas ofIllinois as non-attainment with the 2010 primary one-hourNAAQS. 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). When the conditions ofthis subsection (a)(5) have been fulfilled, or USEPA has removed 40 CFR 50.4. the Board will remove the standard ofthis subsection (a) as obsolete. b) 1971 secondary three-hourNAAOS for sulfur oxides (as SO:J.,. 1) The level ofthe 1971 secondary three-hour NAAQS for sulfur oxides is 0.5 ppm, not to be exceeded more than once per calendar year. The threehour averages must be detetmined from successive non-overlapping threehourblocks stmiing at midnight each calendar day and must be rounded to one decimal place (fractional parts equal to or greater tha11 0.05 ppm must berounded up). 2) Sulfur oxides must be measured in the ambient air as SO, bythe FRM described in appendix A-2 to 40 CFR 50, incorporated byreference in113

Section 243 .I08, or by an FEM designatedbyUSEPA and listed in List of Designated Methods, incorporated byreference in Section 243.108. 3) To demonstrate attainment, the second-highest three-hour average must be based upon hourly data that are at least 75 percent complete ineach calendar quarter. A three-hourblock average must be considered valid only ifall three hourly averages for the three-hourperiod are available. If only one or two hourly averages are available, but the three-hour average would exceed the level ofthe standard when zeros are substituted for the missing values, subject to the rounding mle ofsubsection (b)(]) ofthis Section, then this must be considered a valid tlu·ee-hour average. In all cases. the three-hour block average must be computed as the sum ofthe hourly averages divided bythree.
BOARD NOTE: This subsection (b) is derived from 40 CFR 50.5 (2012). c) 2010 primarv one-hourNAAOS for sulfur oxides (as S02). I) The level ofthe 20I0 primary one-hourNAAOS for sulfur oxides is 7 5 ppb, measured inthe ambient air as SO,. 2) The 20I0 one-hourprimaryNAAOS for sulfur oxides is met at an ambient air quality monitoring site when the three-year average ofthe annual (99th percentile) ofthe daily maximum 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 by a FRM based on appendix A-1 or A-2 of40 CFR 50, incorporated byreference in Section 243.108, orby a 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 CFR50.17 (2012). The 1971 primaryNAAOS for SO, remains in effect until the federal conditions of40 CFR 50.4(e) have been fulfilled, as outlined in subsection (a)C5) ofthis Section and the appended Board note. (Source: Amended at 3 7 Ill. Reg.

___ , effective

_________ .../


### Section 243.123 Carbon Monoxide 

## a1 StaaEiaFEIS. The araeieat air EfHality staaEiarEis fer eareearaeaelliEie are: 1) A raalliFHUra 8 heur eoaeeatratiea net te ee eJteeeEieEI raere than ease !ler year oflG railligrams !ler eueie raeter (9 !l!lra); aaEI,114

2) A maJtimllnl. I hoar eoHeeHtratiofl Hot to ee eJteeeaea more thGF! OF!ee 13er year of4Q milligramsj3er eaeie meter (35 j3j3m). 13) Measaremeflt Methoa. For Eletermimflg eoHfoF!FlaHee with the eareofl moHoKiae air quality staf!aara, SarBOFl mOFlOKiae shallee measmeaeythe FlOFlEiiSj3eFsive in£·area Sj3eetrometry teeemque as Eleserieea ffi 40 CPR50, fl<j3j3. C (1982), 38 Pea. Reg. ?2,391, l'!o;•emeer 25, 1971, orB')" afl eqai'raleflt methoa aj3j3roveaey the AgeHey. a) The 1971 eight-hour and one-hourprimaryNAAQS for carbon monoxide are as follow: I) An eight-hour average concentration of9 ppm (I0 

### mglm\ 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 once peryear. b) The levels ofcarbon monoxide inthe ambient air must bemeasured by a method that fulfills either ofthe following requirements: I) AnFRM based on appendix C of40 CFR 50. incorporated byreference in Section 243.108. and designated byUSEPA and listed in List of Designated Methods. incorporated byreference in Section 243.108. or 2) AnFEM designated by USEPA and listed in List ofDesignated Methods. incorporated byreference in Section 243.108. c) An eight-hour average concentration mustbe considered valid ifat least 75 percent ofthe hourly average for the eight-hour period are available. In the event that only six-hour (or seven-hour) averages are available. the eight-hour average must be computed on the basis ofthe hours available using six (or seven) as the divisor. d) When summatizing data for comparisonwith the standards. averages mustbe stated to one decimal place. Comparison ofthe datawith the levels ofthe standards inppmmustbemade in tetms ofintegers with fractional parts of0.5 or greater rounded up. BOARD NOTE: This Section is detived from 40 CFR 50.8 (2012). (Source: Amended at 37 IlL Reg.

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

### 115

Section 243.124 Nitrogen Oxides (Nitrogen Dioxide as Indicator) a) Stafleanl. The amlliefll air quality stafleafe fer flitregefl Eliexiee is afl armual arithHietie meafl eefleefltratiefl eflGG mieregramsjler**e~>eie** meter (G.G§ ll!lffl). e) Measm8Ffleflt Methee. FerEleteffflifliflg eef!feffflaf!ee with the f!itregefl ei8lliee air quality stafleare, flitregefl ei8lliee shall ee meaSHfee eythe eelerimetrie methee as Eleserieee ifl3e Fee. Reg. 22,396, J>levefflher 15, 1971, erey afl eEjHivaleflt methee ajljlf8Yee eythe Agefl6)'. 

### a) The level ofthe 1971 primary annual average NAAQS for nitrogen oxides is 53 ppb. annual average concentration. measured in the ambient air as nitrogen dioxide (NOzl. b) The level ofthe 2010 primary one-hourNAAQS for nitrogen oxides is 100 ppb. one-hour average concentration. measured in the ambient air as NQ,. c) The level ofthe 1971 secondary annual average NAAQS for nitrogen oxides is 0.053 ppm (100 1.\glm\ annual arithmetic mean concentration. measured in the ambient air as NO,. d) The levels ofthe standards in subsections (a) through (c) ofthis Section must be measured by:
1) 

### A FRM based on appendix F to 40 CFR 50. incorporated byreference in Section 243.108. and designated byUSEPA and listed in List of Designated Methods. incorporated byreference in Section 243.108; or 2) By a Federal FEM designated by USEPA and listed inList ofDesignated Methods. incOluorated byreference in Section 243.108. e) The 1971 primary annual average NAAQS for nih·ogen oxides in subsection (a) of this Section is met when the 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. incorporated byreference in Section 243.108 for the annual standard. f) 

### The 2010 one-hour primaryNAAQS for nitrogen oxides in subsection (b) ofthis Section is met when the three-year average ofthe annual 98th percentile ofthe daily maximum 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 average NAAQS for nitrogen oxides in subsection (c) ofthis Section is attained when the annual arithmetic mean concentration in a calendar year is less than or equal to 0.053 ppm. rounded to three decimal places (fractional parts equal to or greater than 0.0005 ppm mustbe rounded up). To116

demonstrate attainment, an annual meanmustbebased upon hourly data that are at least 7 5 percent complete orupon data derived from manual methods that are at least 75 percent complete for the scheduled sampling days in each calendar quarter.
BOARD NOTE: This Section is derived from 40 CFR50.11 (2012). (Source: Amended at 37 Ill. Reg.

____ ., effective

_________ __, 

### Section 243.125 8 IleHF 

### Ozone a) Stafldanl The primary afld seeefldary amlliefll air EjHality stafldards for ezefle are 0.075 p1_3n1 (parts per milliea) Elaily n1aKimHFB:: g BoHr average eeaeeE:tration, fl1easured afld determifled ifl aeeerda!'lee with SHeseetiefl (e). e) MeasHremefll Methee. Ozefle shallee measHred ey a federal eEjHicvaleflt fl1ethed eased efl 4G CFR 5G, appefldiJ< D a!'ld desigflated ifl aeeerda!'lee ·.vith 4G CFR 53 (ifleeFJ!leratee eyrefereflee ifl Seetiefl 243.1G8) er afl eEjHivalefll methed desigflated ifl aeeerda!'lee ·.vith 4G CFR53. Theprimary afld seee!'ldary ameieflt air Efl:lality stanElarEis are metwheE: the average oftHe annHal**~Uith** highest Elaily maKiflllim 8 heHr &verage ezefle eefleefl!ratiefl is less thafl sf eEjHal te G.G75 ppm, as determiflee Hsiflg 4G CFR5G, appeFldiK P (ifleeFJ!lerated eyrefereflee ifl Seetiefl 243.1G8). a) 1979 primary and secondary one-hourNAAOS for ozone. 1) The level ofthe 1979 primmy and secondary one-hourNAAQS for ozone measured by an FRMbased on appendix D to 40 CFR 50. incomoratedby reference in Section 243.108 and designated byUSEPA and listed in List ofDesignatedMethods. incomoratedbyreference in Section 243.108, is 0.12 ppm (235 u.g!m\ The NAAQS is attained when the expected number ofdays per calendaryearwith maximumhourly average concentrations above 0.12 ppm (235 u.g/m3) is equal to orless than Las determined by appendix H to 40 CFR 50, incmporatedbyreference in Section 243.108. 2) The 1979 primary and secondary one-hourNAAQS for ozone set forth in this subsection (a) will remain applicable to all areas notwithstanding the promulgation ofthe 2008 eight-hourprimary and secondaryNAAQS for ozone set forth in subsection (b) ofthis Section. USEP A has stated in CO!Tesponding 40 CFR 50.9(b) that the one-hourprimary and secondary NAAQS for ozone set forth inthis subsection (a) will no longer apply to an area one year after the effective date ofthe designation ofthat area by USEPA pursuantto 42 UCS 7407 for the 2008 eight-hourP'imary and secondaryNAAQS for ozone. USEPA has codified the area designations and classifications with respect to the primary and secondary 1997 one-117

hourNAAOS and the 2008 primary and secondmy NAAOS for ozone in 40 CFR 81.314.

¢ BOARD NOTE: This subsection (a) is detived from 40 CFR 50.9 (2012). USEPA revoked the 1979 primary and secondary one-hourNAAOS for ozone for all m·eas in Illinois effective June 15,2005. See 40 CFR 81.314 (table for onehourNAAOS for ozone, note 3: 70 Fed. Reg. 44470, 75 (Aug. 3, 2005). USEPA's state implementationplan (SIP) regulations, however, provide that the State may first apply for modification ofthe SIP for the 1997 primary and secondmy one-hourNAAOS for ozone eight years after the revocation. which is on or after June 15,2013. See 40 CFR 51.905(e). Since there is no indication that USEPA has approved such a SIP modification. the Board has retained the 1979 mimary and secondary one-hourNAAOS for ozone of50 CFR 50.9. b) 1997 mimary and secondary eight-hourNAAOS for ozone. I) The 1997 hourp1imary and secondary eight-hour NAAOS for ozone, measured by a FRMbased on appendix D to 40 CFR 50. incmporated by reference in Section 243.108 and designated byUSEPA and listed in List ofDesignated Methods, incomoratedbyreference in Section 243.108. is 0.08 ppm. dailymaximum eight-hour average. 2) The 1997 primary and secondary eight-hourNAAOS for ozone is met at an aJUbient air quality monitming site when the average ofthe annual fom1h-highest daily maximum eight-hour average ozone concentration is less than or equal to 0.08 ppm. as determined in accordance with appendix I to 40 CFR 50. incmporated byreference in Section 243.108. 3) USEPA has stated in corresponding 40 CFR 50.10(c) that the 1997 primary and secondary eight-hour NAAOS for ozone set forth in subsection (b)(]) ofthis Section will no longer apply to an area for transportation conformity pumoses one year after the effective date of USEPA designation ofthat area pursuant to 42 USC 7407 for the 2008 primary and secondary eight-hourNAAOS set forth for ozone in subsection (c)(]) ofthis Section. The 1997 primary and secondary eighthourNAAOS for ozone set forth in this subsection (b) will remain applicable to all areas for all otherpmposes notwithstanding the 2008 primary and secondary eight-hour NAAOS for ozone set forth in subsection (c) ofthis Section orthe USEPA designation ofareas for that 2008 primary and secondary eight-hourNAAOS for ozone. BOARD NOTE: USEPA has codified area designations and classifications with respect to the 1997 and 2008 

### mimmy and secondary NAAOS for ozone in 40 CFR 81.314. WhenUSEPA has taken action and the conditions ofsubsection (b)(3) have been fulfilled. or USEPA has removed 40 CFR 50.9 or 50.10, the Board will remove obsolete 1997118
p1imary and secondary one-hour or eight-hourNAAOS for ozone from subsections (a) and (b).
BOARD NOTE: This subsection (b) is derived from 40 CFR 50.10 (2012). c) 2008 primary and secondary eight-hour NAAOS for ozone. 1) The 2008 p1imary and secondary eight-hourNAAOS for ozone is 0.075 ppm. daily maximum eight-hour average. measured by an FRMbased on appendix D to 40 CFR50. incorporated byreference in Section 243.108. and designated byUSEP A and listed in List ofDesignated Methods. incorporated byreference in Section 243.108 or an FEM designated by USEPA and listed inList ofDesignated Methods. incorporated by reference in Section 243.108. 2) The 2008 primaryand secondary eight-hourNAAOS for ozone ambient air quality standards are met at an ambient air qualitvmonitoring site when the three-year average ofthe annual fomth-highest daily maximum eight-hour average ozone concentrationis less than orequal to 0.075 ppm. as detennined in accordance with appendix P to 40 CFR 50. incmporated byreference in Section 243.108.
BOARD NOTE: This subsection (c) is derived from 40 CFR 50.15 (2012). (Source: Amended at 37 Ill. Reg.

____ , effective

_________ ...J 

### Section 243.126 Lead 

### a) Staf!aanl. Tlie J3rimary af!a seeef!aary amaieflt air EJ:Hality staf!aaras for leaa af!a its eemJ3mmds measurea as elemefllalleaa are G.l §**flg;'m~,** 

### maJtimum. relliag !flree mefllfl average measurea ana aeteFH!med ever athree year J3e1iea. a) Measuremelll Me!flea. FeraeteFH!ifliflg eef!fonnaf!ee witli !fle iHl'!Bieflt air EJ:uality staf!aaras fer leaa afla its eeffiJ3SUflas, lead afla its 68ff1J38Uflas sliall ae ff!easurea as elefflefllalleaa ay foaeral eEJ:Hivaleflt me!flea aasea efl 4

### QCFR §Q apJ3eflail< G 

### afla aesigflatea ID aeeeraaflee ·.vi!fl4G CFR §3, Sfay afl BEj:tlivalefll ffletflea desigflatea ifl aeeeraaf!ee ·.vi!fl4G CFR §3 (ifleSrJ3eratea ayreferef!ee ifl 

### Seetiefl 24

### 3.IG8).. CeffiJ3liaflee ·.villi !fle J3rimary ana seeef!aary affiBiefll air EJ:Hality staflaaras sliall ae aeteRfliflea ifl 

### aeeeraaflee witli 

### 4 GCFR §Q, apJ3eflaiJ< R (ifleSrJ3erated ayreforef!ee ifl 

### Seetiefl243

### .1G8). a) 1978 primary and secondary quarterly averageNAAOS for lead.
1) The 1978 primary and secondary qumterly average NAAOS for lead and its compounds. measured as elemental lead by an FRMbased on appendix G to 40 CFR 50. incomoratedbyreference in Section 243.108. and119
designated byUSEPA and listed inList ofDesignated Methods. incomorated byreference in Section 243.108. orby an FEM designatedby USEPA and listed inList ofDesignated Methods. incorporated by reference in Section 243.108. is 1.5 micrograms per cubic meter. maximum arithmetic mean averaged over a calendar quarter. 2) The 1978 primary and secondary quaJierly average NAAOS for lead set fmih inthis subsection will remain applicable to all areas notwithstanding the 2008 primary and secondary quarterly average NAAOS for lead in subsection (b) ofthis Section. The 1978 primmy and secondary quaJierly average NAAOS for lead set forth in this subsection (a) will no longer applyto an area one year after the effective date ofthe designation ofthat area byUSEPA pursuant to 42 USC 7407 for the 2008 primary and secondarythree-month average NAAOS for lead set forth in subsection (b) ofthis Section: except that for areas designated nonattainment for the 1978 primary and secondary quarterly average NAAOS for lead set forth in this subsection (a) as ofJanuary 12.2009. the 1978 PJimmy and secondaryNAAOS for lead set forth in this subsection (a) will applyuntil USEPA has approved an implementation plan for that m·ea pursuant to 42 USC 7514 providing for attainment or maintenance ofthe 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 corr-esponding 40 CFR 50.12(b) relative to the effective date of40 CFR50.16. January 12. 2009 is the effective date recited at 73 Fed. Reg. 66964 (Nov. 12. 2008). USEPA designated Granite City as nonattainment with the 2008 primary and secondaJY three-month average NAAOS for lead in 20I0 and an area ofChicago in 20II. USEPA designated all other areas oflilinois for the 2008 primary and secondary three-month average NAAOS 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 NAAOS for lead. I) The 2008 primary and secondary three-month average NAAOS for lead and its compounds is 0.15 ug/m3• mithmetic mean concentration over a three-month period. measured in the ambient air as lead by either ofthe following:120
A) AnFRMbased onAppendix G of40 CFR 50, incorporated by reference in Section 243.108 and designated byUSEPA and listed in List ofDesignated Methods, incorporated byreference in Section 243.108 or; B) AnFEMdesignated by USEPA and listed inList ofDesignated Methods. incmporatedbyreference in Section 243.108. 2) The 2008 primary and secondary three-month averageNAAQS for lead are metwhen the maximum arithmetic three-month mean concentration for a three-yearpe1iod. as determined in accordance with Appendix R of 40 CFR50, incorporated byreference in Section 243.108, is less than or equal to 0.15 ug/m3
BOARD NOTE: This subsection (b) is derived from 40 CFR 50.16 (2012). (Source: Amended at 37 Ill. Reg.

___ , effective----------' Section 243.APPENDIX A Rule into Section Table (Repealed) Appendix A Rule into Section Table 8ECTirnl
243.102 243.103 243.104 ,'<!l!l

### e;uiiK C 243.106 243.107 243.121 243.122 

### RBflealee 243.123 243.124 243.125 243.126 (Source: Repealed at 3 7 Ill. Reg. , effective

--- ________ _J

### 121

Section 243.APPENDIX B Section into Rule Table (Repealed) AppendixB Section into Rule Table
SECTim!
243.101 243.102 J\H. 243.103**~** 243.104 

### J03 243.109**~** 243.107 :;oe 243.121 J07 243.122**~** 243.123 M*l ?43.124 

### *+ 243.12§**~** 243.129**~** 

### (Source: Repealed at 37 Ill. Reg. , effective----------' Section 243.APPENDIX C PastCompliance Dates (Repealed) Appendix C Past Compliance Dates EKeejlt as ethe1wise aeted, eemjlliaaee wi-th this Pmt was reEjtlired fuae 29, 1973. 

### (Source: Repealed at 37 Ill. 

### Reg.

___ , effective

_________ -'
Section 243.TABLE A Schedule ofExceptional EventFlagging and Documentation Submission for New orRevised NAAQS

NAAQS (Level) Regulatory Citations 2006 24-hour 

### PMz s 

### (35 ug/m3) 

### Section 243.120(c)(l) 40 CFR 50.13(a) 71 Fed. Reg. 61144 (Oct. 17. 2006) Air 

### quality data collected Event flagging & 

### for calendar initial desc1iption year deadline 2004-2006 October 1. 2007 Detailed documentation submission deadline April 15, 2008122

2008 eight-hour ozone 2005-2007 June 18, 2009 June 18, 2009 (0.075 ppm) 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 guarter ofthe calendar guarter 73 Fed. Reg. 16436 (Mar. in which the event in which the event 27, 2008} occurred or February occurred or February 5, 2010, whichever 5. 2010. whichever date occurred first date occurred first 2010 one-hour nitrogen 2008 July 1. 2010 Januaey 22. 2011 oxides (as NO;U 2009 July 1. 2010 Januat:y 22, 2011 (100 ppb} 2010 Aprill, 2011 July 1. 2010 Section 243.124(b} 40 CFR 50.ll(b} 75 Fed. Reg. 6474 (Feb. 9. 2010} 2010 one-hour sulfur 2008 October 

### 1. 2010 June 1, 2011 oxides (as SO,} 2009 October 

### 1. 2010 June 1. 2011 (75 ppb} 2010 June 1. 2011 June 1,2011 Section 243.122(c}(l} 2011 60 days after the end 60 days after the end 40 CFR 17(a} ofthe calendar gua1ter ofthe calendar guarter 75 Fed. Reg. 35520 (June in which the event in which the event 22. 2010} occuned or March 31. occmTed or March 31. 2012. whicheverdate 2012. whichever date OCCUlTed first occured first

BOARD NOTE: Derived from table 1 to 40 CFR 50.14(c} (2012}. USEPA noted that the infmmation inthis table ofrevised deadlines only applies to data that USEPA will use to establish the final initial designations for new orrevised NAAQS. USEPA stated that the general schedule in this table applies for all other pumoses. most notably. for data that USEPA will use for redesignations to attainment. Corresponding table l to 40 CFR 50.14(c}(2} cites the 2010 one-hourNAAQS for nitrogen oxides as "80-100 PPB, fmallevel TBD" and the 2010 onehourNAAOS for sulfur oxides as "80-100 PPB, final level TBD." The adopted 2010 one-hour NAAQS for NOx at 40 CFR 50.11W is 100 ppb and the adopted 2010 one-hourNAAQS for SO, is 75 ppb. TheBoardhas used the actual NAAQS for these contaminants in this Table A. Fmther. conespondingtable 1to 40 CFR 50.14(c} includes endnotes "a" and "b" indicate whetherdates for N0 2 and S02 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.123
I, John

### T. The!Tiault, Assistant Clerk ofthe illinois Pollution Control Board, ce1tify that the Board adopted the above opinion and order on May 16, 2012, by a vote of5-0.

John T. The!Tiault, Assistant Clerk Illinois Pollution Control Board