9204 Federal Register / Vol. 80, No. 34 / Friday, February 20, 2015 / Rules and Regulations 

the Federal Register. A major rule 

cannot take effect until 60 days after it 

is published in the Federal Register. 

This action is not a ‘‘major rule’’ as 

defined by 5 U.S.C. 804(2). 

Under section 307(b)(1) of the Clean 

Air Act, petitions for judicial review of 

this action must be filed in the United 

States Court of Appeals for the 

appropriate circuit by April 21, 2015. 

Filing a petition for reconsideration by 

the Administrator of this final rule does 

not affect the finality of this action for 

the purposes of judicial review nor does 

it extend the time within which a 

petition for judicial review may be filed, 

and shall not postpone the effectiveness 

of such rule or action. Parties with 

objections to this direct final rule are 

encouraged to file a comment in 

response to the parallel notice of 

proposed rulemaking for this action 

published in the proposed rules section 

of today’s Federal Register, rather than 

file an immediate petition for judicial 

review of this direct final rule, so that 

EPA can withdraw this direct final rule 

and address the comment in the 

proposed rulemaking. This action may 

not be challenged later in proceedings to 

enforce its requirements. (See section 

307(b)(2).) 

List of Subjects in 40 CFR Part 52 

Environmental protection, Air 

pollution control, Incorporation by 

reference, Intergovernmental relations, 

Ozone, Reporting and recordkeeping 

requirements, Volatile organic 

compounds. 

Dated: December 30, 2014. 

Susan Hedman, 

Regional Administrator, Region 5. 

40 CFR part 52 is amended as follows: 

PART 52—APPROVAL AND 

PROMULGATION OF 

IMPLEMENTATION PLANS 

■ 1. The authority citation for part 52 

continues to read as follows: 

Authority: 42 U.S.C. 7401 et seq. 

■ 2. Section 52.720 is amended by 

adding paragraph (c)(202) to read as 

follows: 

§ 52.720 Identification of plan. 

* * * * * 

(c) * * * 

(202) On June 10, 2014, Illinois 

submitted revised regulations that are 

consistent with 40 CFR 51.100(s)(1). The 

compounds (difluoromethoxy) 

(difluoro)methane (CHF2OCHF2 or HFE– 

134), bis(difluoromethoxy) 

(difluoro)methane (CHF2OCF2OCHF2 or 

HFE–236cal2), 1-(difluoromethoxy)-2- 

[(difluoromethoxy) ((difluoro)methoxy]- 

1,1,2,2-tetrafluoroethane 

(CHF2OCF2OCF2CF2OCHF2 or HFE–43– 

10pccc), 1,2-bis(difluoromethoxy)- 

1,1,2,2-tetrafluoroethane 

(CHF2OCF2CF2OCHF2 or HFE– 

338pcc13), and trans 1-chloro-3,3,3- 

trifluoroprop-1-ene (CF3CHCHCl) were 

added to the list of negligibly reactive 

compounds excluded from the 

definition of ‘‘Volatile Organic Material 

(VOM)’’ or ‘‘Volatile Organic Compound 

(VOC)’’ at 35 IAC 211.7150(a). 

(i) Incorporation by reference. 

Illinois Administrative Code Title 35: 

Environmental Protection; Subtitle B: 

Air Pollution; Chapter I: Pollution 

Control Board; Subchapter c: Emission 

Standards and Limitations for 

Stationary Sources; Part 211: Definitions 

and General Provisions; Subpart B: 

Definitions; Section 211.7150: Volatile 

Organic Material (VOM) or Volatile 

Organic Compound (VOC), effective 

November 27, 2013. 

[FR Doc. 2015–03450 Filed 2–19–15; 8:45 am] 

BILLING CODE 6560–50–P 

ENVIRONMENTAL PROTECTION 

AGENCY 

40 CFR Part 52 

[EPA–R06–OAR–2014–0554; FRL–9923–19– 

Region 6] 

Approval and Promulgation of 

Implementation Plans; Texas; 

Emissions Inventories for the DallasFort Worth and Houston-GalvestonBrazoria Ozone Nonattainment Areas 

AGENCY: Environmental Protection 

Agency (EPA). 

ACTION: Direct final rule. 

SUMMARY: The Environmental Protection 

Agency (EPA) is approving revisions to 

the Texas State Implementation Plan 

(SIP) submitted to meet Emissions 

Inventory (EI) requirements of the Clean 

Air Act (CAA) for the Dallas-Fort Worth 

(DFW) and the Houston-GalvestonBrazoria (HGB) nonattainment areas. 

EPA is approving the SIP revisions 

because they satisfy the CAA EI 

requirements for the DFW and HGB 

nonattainment areas under the 2008 

eight-hour ozone National Ambient Air 

Quality Standards (NAAQS). EPA is 

approving the revisions pursuant to 

section 110 and part D of the CAA and 

EPA’s regulations. 

DATES: This direct final rule will be 

effective April 21, 2015 without further 

notice, unless EPA receives adverse 

comment by March 23, 2015. If EPA 

receives adverse comment, we will 

publish a timely withdrawal of the 

direct final rule in the Federal Register 

informing the public that the rule will 

not take effect. 

ADDRESSES: Submit your comments, 

identified by Docket No. EPA–R06– 

OAR–2014–0554, by one of the 

following methods: 

• www.regulations.gov. Follow the 

online instructions. 

• Email: Ms. Nevine Salem at 

salem.nevine@epa.gov. 

• Mail or delivery: Mr. Guy 

Donaldson, Chief, Air Planning Section 

(6PD–L), Environmental Protection 

Agency, 1445 Ross Avenue, Suite 1200, 

Dallas, Texas 75202–2733. 

Instructions: Direct your comments to 

Docket No. EPA–R06–OAR–2014–0554. 

EPA’s policy is that all comments 

received will be included in the public 

docket without change and may be 

made available online at 

www.regulations.gov, including any 

personal information provided, unless 

the comment includes information 

claimed to be Confidential Business 

Information (CBI) or other information 

whose disclosure is restricted by statute. 

Do not submit information that you 

consider to be CBI or otherwise 

protected through www.regulations.gov 

or email. The www.regulations.gov Web 

site is an ‘‘anonymous access’’ system, 

which means EPA will not know your 

identity or contact information unless 

you provide it in the body of your 

comment. If you send an email 

comment directly to EPA without going 

through www.regulations.gov your email 

address will be automatically captured 

and included as part of the comment 

that is placed in the public docket and 

made available on the Internet. If you 

submit an electronic comment, EPA 

recommends that you include your 

name and other contact information in 

the body of your comment and with any 

disk or CD–ROM you submit. If EPA 

cannot read your comment due to 

technical difficulties and cannot contact 

you for clarification, EPA may not be 

able to consider your comment. 

Electronic files should avoid the use of 

special characters, any form of 

encryption, and be free of any defects or 

viruses. 

Docket: The index to the docket for 

this action is available electronically at 

www.regulations.gov and in hard copy 

at EPA Region 6, 1445 Ross Avenue, 

Suite 700, Dallas, Texas. While all 

documents in the docket are listed in 

the index, some information may be 

publicly available only at the hard copy 

location (e.g., copyrighted material), and 

some may not be publicly available at 

either location (e.g., CBI). 

FOR FURTHER INFORMATION CONTACT: Ms. 

Nevine Salem, (214) 665–7222, 


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salem.nevine@epa.gov. To inspect the 

hard copy materials, please schedule an 

appointment with Ms. Salem or Mr. Bill 

Deese at 214–665–7253. 

SUPPLEMENTARY INFORMATION: 

Throughout this document wherever 

‘‘we,’’ ‘‘us,’’ or ‘‘our’’ is used, we mean 

the EPA. 

Table of Contents 

I. Background 

II. EPA’s Evaluation 

III. Final Action 

IV. Statutory and Executive Order Reviews 

I. Background 

A. The 2008 Ozone National Ambient 

Air Quality Standards (NAAQS) and 

Emissions Inventory Requirements 

On March 12, 2008 EPA revised the 

eight-hour ozone NAAQS from 0.08 

parts per million (ppm) to 0.075 ppm. 

(73 FR 16436, March 27, 2008). On July 

12, 2012 EPA designated nonattainment 

areas for the 2008 ozone NAAQS (2008 

ozone nonattainment areas) (77 FR 

30088, May 21, 2012). The DFW and 

HGB areas were designated as 

nonattainment areas for the 2008 ozone 

NAAQS. Id. The DFW area consists of 

Collin, Dallas, Denton, Ellis, Johnson, 

Kaufman, Parker, Rockwall, Tarrant and 

Wise counties. The HGB area consists of 

Brazoria, Chambers, Fort Bend, 

Galveston, Harris, Liberty, Montgomery 

and Waller counties. 

CAA sections 172(c)(3) and 182(a)(1) 

require states to develop and submit as 

a SIP revision an emissions inventory 

for all areas designated as 

nonattainment for the ozone NAAQS. 42 

U.S.C. 172(c) and 182(a). An emissions 

inventory is an estimation of actual 

emissions of air pollutants in an area. 

Ground-level ozone, O3, is a gas that is 

formed by the reaction of volatile 

organic compounds (VOCs) and oxides 

of nitrogen (NOX) in the atmosphere in 

the presence of sunlight. These 

precursor emissions are emitted by 

many types of pollution sources, 

including power plants and industrial 

emissions sources, on-road and off-road 

motor vehicles and engines, and smaller 

sources, collectively referred to as area 

sources. The EIs provide data for a 

variety of air quality planning tasks 

including establishing baseline emission 

levels, calculating federally required 

emission reduction targets, emission 

inputs into air quality simulation 

models, and tracking emissions over 

time. The total EI of VOC and NOX for 

an area are summarized from the 

estimates developed for five general 

categories of emissions sources: Point, 

area, on-road mobile, non-road mobile, 

and biogenic. EPA’s proposed 2008 

ozone standard SIP requirements rule 

suggested that states use 2011 as a base 

year to address EI requirements (78 FR 

34178, 34190, June 6, 2013). 

B. SIP Revision Submitted on July 16, 

2014 

Texas adopted a SIP revision 

addressing the emissions inventory 

requirements for the DFW and HGB 

areas on July 2, 2014 and submitted it 

to EPA on July 16, 2014. Tables 1 and 

2 are the DFW and HGB emissions 

inventories in the SIP revision. 

TABLE 1—DFW 2011 EMISSIONS INVENTORY

[tons per day or tpd] 

Source type NOX VOC 

Point ................................................................................................................................................................................. 39.95 29.80 

Area ................................................................................................................................................................................. 42.64 292.49 

On-road Mobile ................................................................................................................................................................ 238.87 98.36 

Non-road Mobile .............................................................................................................................................................. 120.61 55.00 

Total .......................................................................................................................................................................... 442.08 475.65 

TABLE 2—HGB 2011 EMISSIONS INVENTORY

[tpd] 

Source type NOX VOC 

Point ................................................................................................................................................................................. 108.44 94.83 

Area ................................................................................................................................................................................. 21.14 308.73 

On-road Mobile ................................................................................................................................................................ 196.21 82.62 

Non-road Mobile .............................................................................................................................................................. 121.11 49.93 

Total .......................................................................................................................................................................... 446.90 536.12 

C. CAA Requirements for the SIP 

Revision 

The primary CAA requirements 

pertaining to the SIP revision submitted 

by Texas are found in CAA sections 

110(l), 172(c)(3) and 182(a)(1). 42 U.S.C. 

110(l), 172(c)(3), and 182(a). CAA 

section 110(l) requires that a SIP 

revision submitted to EPA be adopted 

after reasonable notice and public 

hearing. Section 110(l) also requires that 

EPA not approve a SIP revision if the 

revision would interfere with any 

applicable requirement concerning 

attainment and reasonable further 

progress, or any other applicable 

requirement of the CAA. CAA sections 

172(c)(3) and 182(a) requires a SIP 

revision that contains a comprehensive, 

accurate, current inventory of actual 

emissions from all sources. 

II. EPA’s Evaluation 

EPA has reviewed the revision for the 

consistency with the requirements of 

EPA regulations. A summary of EPA’s 

analysis is provided below. For a full 

discussion of our evaluation, please see 

our Technical Support Document (TSD). 

CAA sections 172 (c)(3) and 182(a)(1) 

require a current inventory of actual 

emissions from all sources of relevant 

pollutants in the nonattainment areas. 

EPA Air Emissions Reporting 

regulations call for states to provide an 

emissions inventory from all sources 

every 3 years and required a complete 

inventory for 2011 (40 CFR 51.30). 

Additionally, in proposed rulemaking 

for the 2008 ozone standard we 

proposed that the states use 2011 as the 

base year for EI for the reasonable 

further progress emissions reduction SIP 

requirement (June 6, 2013, 78 FR 34178, 


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34190). Texas has developed a 2011 

base year emissions inventory for the 

DFW and HGB nonattainment areas. 

The 2011 base year emissions includes 

all point, area, non-road mobile, and onroad mobile source emissions. EPA is 

approving the emission inventory for 

DFW and HGB because it contains a 

comprehensive, accurate, current 

inventory of actual emissions from all 

sources in accordance with CAA 

sections 172(c)(3) and 182(a). 

Additionally we find that (1) Texas 

adopted the EI for DFW and HGB after 

reasonable notice and public hearing 

and (2) approval would not interfere 

with any applicable requirement 

concerning attainment and reasonable 

further progress or any other applicable 

requirement of the CAA in accordance 

with CAA Section 110(1). A technical 

support document (TSD) was prepared 

which details our evaluation. Our TSD 

may be accessed online at 

www.regulations.gov, Docket No. EPA– 

R06–OAR–2014–0554. 

III. Final Action 

We are approving a Texas SIP revision 

submitted to address the emissions 

inventory requirements for the DFW and 

HGB 2008 ozone nonattainment areas. 

The inventories we are approving are 

listed in Tables 1 and 2 above. 

EPA is publishing this rule without 

prior proposal because we view this as 

a non-controversial amendment and 

anticipate no adverse comments. 

However, in the proposed rules section 

of this Federal Register publication, we 

are publishing a separate document that 

will serve as the proposal to approve the 

SIP revision if relevant adverse 

comments are received. This rule will 

be effective on April 21, 2015 without 

further notice unless we receive relevant 

adverse comment by March 23, 2015. If 

we receive relevant adverse comments, 

we will publish a timely withdrawal in 

the Federal Register informing the 

public that the rule will not take effect. 

We will address all public comments in 

a subsequent final rule based on the 

proposed rule. We will not institute a 

second comment period on this action. 

Any parties interested in commenting 

must do so now. Please note that if we 

receive relevant adverse comment on an 

amendment, paragraph, or section of 

this rule and if that provision may be 

severed from the remainder of the rule, 

we may adopt as final those provisions 

of the rule that are not the subject of an 

adverse comment. 

IV. Statutory and Executive Order 

Reviews 

Under the CAA, the Administrator is 

required to approve a SIP submission 

that complies with the provisions of the 

Act and applicable Federal regulations. 

42 U.S.C. 7410(k); 40 CFR 52.02(a). 

Thus, in reviewing SIP submissions, 

EPA’s role is to approve state choices, 

provided that they meet the criteria of 

the CAA. Accordingly, this action 

merely approves state law as meeting 

Federal requirements and does not 

impose additional requirements beyond 

those imposed by state law. For that 

reason, this action: 

• Is not a ‘‘significant regulatory 

action’’ subject to review by the Office 

of Management and Budget under 

Executive Orders 12866 (58 FR 51735, 

October 4, 1993) and 13563 (76 FR 3821, 

January 21, 2011); 

• Does not impose an information 

collection burden under the provisions 

of the Paperwork Reduction Act (44 

U.S.C. 3501 et seq.); 

• Is certified as not having a 

significant economic impact on a 

substantial number of small entities 

under the Regulatory Flexibility Act (5 

U.S.C. 601 et seq.); 

• Does not contain any unfunded 

mandate or significantly or uniquely 

affect small governments, as described 

in the Unfunded Mandates Reform Act 

of 1995 (Pub. L. 104–4); 

• Does not have Federalism 

implications as specified in Executive 

Order 13132 (64 FR 43255, August 10, 

1999); 

• Is not an economically significant 

regulatory action based on health or 

safety risks subject to Executive Order 

13045 (62 FR 19885, April 23, 1997); 

• Is not a significant regulatory action 

subject to Executive Order 13211 (66 FR 

28355, May 22, 2001); 

• Is not subject to requirements of 

section 12(d) of the National 

Technology Transfer and Advancement 

Act of 1995 (15 U.S.C. 272 note) because 

application of those requirements would 

be inconsistent with the CAA; and 

• Does not provide EPA with the 

discretionary authority to address, as 

appropriate, disproportionate human 

health or environmental effects, using 

practicable and legally permissible 

methods, under Executive Order 12898 

(59 FR 7629, February 16, 1994). 

In addition, the SIP is not approved 

to apply on any Indian reservation land 

or in any other area where EPA or an 

Indian tribe has demonstrated that a 

tribe has jurisdiction. In those areas of 

Indian country, the rule does not have 

tribal implications as specified by 

Executive Order 13175 (65 FR 67249, 

November 9, 2000), nor will it impose 

substantial direct costs on tribal 

governments or preempt tribal law. 

The Congressional Review Act, 5 

U.S.C. 801 et seq., as added by the Small 

Business Regulatory Enforcement 

Fairness Act of 1996, generally provides 

that before a rule may take effect, the 

agency promulgating the rule must 

submit a rule report, which includes a 

copy of the rule, to each House of the 

Congress and to the Comptroller General 

of the United States. EPA will submit a 

report containing this rule and other 

required information to the U.S. Senate, 

the U.S. House of Representatives, and 

the Comptroller General of the United 

States prior to publication of the rule in 

the Federal Register. A major rule 

cannot take effect until 60 days after it 

is published in the Federal Register. 

This action is not a ‘‘major rule’’ as 

defined by 5 U.S.C. 804(2). 

Under section 307(b)(1) of the CAA, 

petitions for judicial review of this 

action must be filed in the United States 

Court of Appeals for the appropriate 

circuit by April 21, 2015. Filing a 

petition for reconsideration by the 

Administrator of this final rule does not 

affect the finality of this rule for the 

purposes of judicial review nor does it 

extend the time within which a petition 

for judicial review may be filed, and 

shall not postpone the effectiveness of 

such rule or action. This action may not 

be challenged later in proceedings to 

enforce its requirements. (See section 

307(b)(2).) 

List of Subjects in 40 CFR Part 52 

Environmental protection, Air 

pollution control, Incorporation by 

reference, Nitrogen dioxide, Ozone, 

Reporting and recordkeeping 

requirements, Volatile organic 

compounds. 

Dated: February 9, 2015. 

Ron Curry, 

Regional Administrator, Region 6. 

40 CFR part 52 is amended as follows: 

PART 52—APPROVAL AND 

PROMULGATION OF 

IMPLEMENTATION PLANS 

■ 1. The authority citation for part 52 

continues to read as follows: 

Authority: 42 U.S.C. 7401 et seq. 

Subpart SS—Texas 

■ 2. In § 52.2270 (e), the second table 

titled ‘‘EPA Approved Nonregulatory 

Provisions and Quasi-Regulatory 

Measures in the Texas SIP’’ is amended 

by adding an entry at the end for ‘‘2011 

Emissions Inventory for the 2008 Ozone 

NAAQS.’’ 

The addition reads as follows: 

§ 52.2270 Identification of plan. 

* * * * * 

(e) * * * 


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EPA APPROVED NON-REGULATORY PROVISIONS AND QUASI-REGULATORY MEASURES IN THE TEXAS SIP 

Name of SIP provision Applicable geographic or 

nonattainment area 

State submittal/ 

effective date EPA approval date Comments 

*******

2011 Emissions Inventory for the 

2008 Ozone NAAQS.

Dallas-Fort Worth and HoustonGalveston-Brazoria Ozone 

Nonattainment Areas.

7/16/2014 2/20/2015 [Insert Federal Register citation].

[FR Doc. 2015–03449 Filed 2–19–15; 8:45 am] 

BILLING CODE 6560–50–P 

ENVIRONMENTAL PROTECTION 

AGENCY 

40 CFR Parts 52 and 81 

[EPA–R07–OAR–2014–0900; FRL–9923–14– 

Region 7] 

Approval and Promulgation of 

Implementation Plans; Attainment 

Redesignation for Missouri Portion of 

the St. Louis MO–IL Area; 1997 8-Hour 

Ozone Standard and Associated 

Maintenance Plan 

AGENCY: Environmental Protection 

Agency. 

ACTION: Final rule. 

SUMMARY: The Environmental Protection 

Agency (EPA) is taking final action to 

approve the State of Missouri’s request 

to redesignate the Missouri portion of 

the St. Louis MO–IL nonattainment 

area, the ‘‘St. Louis area’’ or ‘‘area’’ to 

attainment for the 1997 8-hour National 

Ambient Air Quality Standards 

(NAAQS or Standard) for ozone (O3). 

The Missouri counties comprising the 

St. Louis area are Franklin, Jefferson, St. 

Charles, and St. Louis along with the 

City of St. Louis. EPA’s approval of the 

redesignation request is based on the 

determination that the St. Louis area has 

met the criteria for redesignation to 

attainment set forth in the Clean Air Act 

(CAA), including the determination that 

the St. Louis area has attained the 1997 

8-hour O3 standard. Additionally, EPA 

is approving the state’s plan for 

maintaining the 1997 O3 standard in the 

St. Louis area for 10 years beyond 

redesignation. In a separate action the 

state of Illinois submitted a similar 

redesignation request for the Illinois 

portion of the St. Louis MO–IL 1997 8- 

hour O3 area. On June 12, 2012, the EPA 

published a document in the Federal 

Register taking final action to address 

the Illinois portion of the St. Louis area. 

DATES: Effective date: This final rule is 

effective on February 20, 2015. 

ADDRESSES: EPA has established a 

docket for this action under Docket ID 

No. EPA–R07–OAR–2014–0900. All 

documents in the docket are listed on 

the www.regulations.gov Web site. 

Although listed in the index, some 

information is not publicly available, 

i.e., CBI or other information whose 

disclosure is restricted by statute. 

Certain other material, such as 

copyrighted material, is not placed on 

the Internet and will be publicly 

available only in hard copy form. 

Publicly available docket materials are 

available either electronically through 

www.regulations.gov or in hard copy at 

the Environmental Protection Agency, 

Air Planning and Development Branch, 

11201 Renner Boulevard, Lenexa, 

Kansas 66219. The Regional Office’s 

official hours of business are Monday 

through Friday, 8:00 a.m. to 4:30 p.m. 

excluding Federal holidays. The 

interested persons wanting to examine 

these documents should make an 

appointment with the office at least 24 

hours in advance. 

FOR FURTHER INFORMATION CONTACT: Ms. 

Lachala Kemp, Environmental 

Protection Agency, Air Planning and 

Development Branch, 11201 Renner 

Boulevard, Lenexa, KS 66219 at (913) 

551–7214 or by email at kemp.lachala@

epa.gov. 

SUPPLEMENTARY INFORMATION: 

Throughout this document whenever 

‘‘we,’’ ‘‘us,’’ or ‘‘our’’ is used, we refer 

to EPA. This section provides additional 

information by addressing the 

following: 

Table of Contents 

I. What is the background for this rule? 

II. Summary of SIP Revisions 

III. What action is EPA taking?? 

IV. Statutory and Executive Order Reviews 

I. What is the background for this rule? 

On July 18, 1997, EPA promulgated a 

revised 8-hour O3 NAAQS of 0.08 parts 

per million (ppm) (62 FR 38856). EPA 

published a final rule designating and 

classifying areas under the 8-hour O3

NAAQS on April 30, 2004 (69 FR 

23857). In that rulemaking, the St. Louis 

area was designated as nonattainment 

for the 1997 8-hour O3 standard and 

classified as a moderate nonattainment 

area under subpart 2 of the CAA. 

On November 3, 2011, Missouri 

requested redesignation of the Missouri 

portion of the St. Louis area to 

attainment of the 1997 8-hour O3

standard, and requested approval of the 

Missouri SIP revision containing a 

maintenance plan for the Missouri 

portion of the St. Louis area. Missouri 

submitted a supplement to this request 

on April 29, 2014. 

On June 9, 2011 (76 FR 33647), EPA 

issued a final rulemaking determining 

that the entire St. Louis MO–IL area 

attained the 1997 8-hour O3 NAAQS 

based on three years of complete, 

quality assured O3 data for the period of 

2008–2010. 

On December 31, 2014(79 FR 78755), 

EPA published a notice of proposed 

rulemaking (NPR) proposing to approve 

Missouri’s request to redesignate the 

Missouri portion of the St. Louis area to 

attainment of the 1997 8-hour O3

standard, and also proposing to approve 

Missouri’s maintenance plan for the 

area. The proposed rulemaking provides 

a detailed discussion and sets forth the 

basis for determining that Missouri’s 

redesignation request meets the CAA 

requirements for redesignation to 

attainment for the 1997 8-hour O3

NAAQS. 

The primary background for this 

action is contained in EPA’s December 

31, 2014, proposal to approve Missouri’s 

redesignation request, and in EPA’s June 

9, 2011, final rulemaking determining 

that the area has attained the 1997 8- 

hour O3 standard based on complete, 

quality assured monitoring data for 

2008–2010. In these rulemakings, we 

noted that under EPA regulations at 40 

CFR 50.10 and 40 CFR part 50, 

appendix I provides that the 8-hour O3

standard is attained when the three-year 

average of the annual fourth-highest 

daily maximum 8-hour average O3

concentration is less than or equal to 

0.08 ppm, when rounded at all 

monitoring sites in the area. See 69 FR 

23857 (April 30, 2004). To support the 

redesignation of the area to attainment 

of the NAAQS, the O3 data must be 

complete for the three attainment years. 

The data completeness requirement is 

met when the average percent of days 

with valid ambient monitoring data is 


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