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Federal Register / Vol. 86, No. 187 / Thursday, September 30, 2021 / Rules and Regulations

SUPPLEMENTARY INFORMATION:
Throughout this document we, us, and our refer to EPA.

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Table of Contents ENVIRONMENTAL PROTECTION
AGENCY
40 CFR Part 52
EPAR07OAR20210405; FRL870802
R7

Air Plan Approval; Approval of Missouri Air Quality Implementation Plans; Revisions to St. Louis 1997
PM2.5 Maintenance Plan Environmental Protection Agency EPA.
ACTION: Final rule.
AGENCY:

The Environmental Protection Agency EPA is taking final action to approve a State Implementation Plan SIP revision submitted by the State of Missouri on November 12, 2019, revising the maintenance plan demonstrating continued maintenance of the 1997 PM2.5 National Ambient Air Quality Standards NAAQS in the St.
Louis area. This revision demonstrates that the St. Louis area no longer needs to rely on the vehicle Inspection and Maintenance I/M program and the use of Reformulated Gasoline RFG for continued maintenance throughout the maintenance period for the 1997 PM2.5
NAAQS. The EPA has determined that this revision meets the requirements of the Clean Air Act CAA.
DATES: This final rule is effective on November 1, 2021.
ADDRESSES: The EPA has established a docket for this action under Docket ID
No. EPAR07OAR20210405. All documents in the docket are listed on the https www.regulations.gov website. Although listed in the index, some information is not publicly available, i.e., confidential business information 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 through https
www.regulations.gov or please contact the person identified in the FOR FURTHER
INFORMATION CONTACT section for additional information.
FOR FURTHER INFORMATION CONTACT:
Steven Brown, Environmental Protection Agency, Region 7 Office, Air Quality Planning Branch, 11201 Renner Boulevard, Lenexa, Kansas 66219;
telephone number: 913 5517718;
email address: brown.steven@epa.gov.

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SUMMARY:

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I. What is being addressed in this document?
II. Have the requirements for approval of a SIP revision been met?
III. What action is the EPA taking?
IV. Statutory and Executive Order Reviews
I. What is being addressed in this document?
The EPA is taking final action to approve SIP revisions submitted by the State of Missouri on November 12, 2019, revising the 1997 PM2.5 maintenance plan. This SIP revision demonstrates continued maintenance of the 1997
PM2.5 NAAQS in the St. Louis area through the future year of 2025. The maintenance area boundary includes the Missouri counties of Franklin, Jefferson, St. Charles, and St. Louis along with the City of St. Louis.
Through this final action, the EPA is approving this maintenance plan into Missouris SIP pursuant to the CAA
section 175A as a replacement to the maintenance plan previously approved by EPA on October 2, 2018 83 FR
38033.
On August 3, 2018, EPA published in the Federal Register a final rulemaking approving the State of Missouris request to redesignate the Missouri portion of the St. Louis nonattainment area to attainment and their demonstration for maintaining the 1997
PM2.5 NAAQS through the ten-year maintenance period. The effective date for this approval was on October 2, 2018
83 FR 38033.
The SIP revision we are approving in this final rulemaking removes the reliance on the St. Louis vehicle Inspection and Maintenance I/M
program and the use of Reformulated Gasoline RFG for continued maintenance of the 1997 PM2.5 standard.
To support this revision, Missouri utilized EPAs 2014 Motor Vehicle Emissions Simulator MOVES2014b emission modeling system to project revised mobile source emissions by removing emissions reductions related to I/M and RFG throughout the maintenance period to the future year of 2025.
EPA is approving this revised maintenance plan based on information provided in the emissions projections, modeling results and an evaluation of quality assured air monitoring data submitted as part of this revision and in a previously reviewed analysis as part of the St. Louis Nonattainment Area 1997
PM2.5 NAAQS Redesignation rulemaking published on August 3,
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2018 83 FR 38033. Current and future projections of air quality and emissions data for this revision demonstrates maintenance for the 1997 PM2.5
NAAQS.
This revision only affects maintenance for the 1997 PM2.5
standard, only removes the reliance upon the I/M and RFG programs for continued maintenance and therefore meets the requirements of the Clean Air Act.
The full text of the plan revisions including Missouris technical demonstration can be found in the States submission, which is included in the docket for this action.
The EPA solicited comments on these proposed revision to Missouris SIP
published on July 28, 2021 86 FR
40395, and did not receive any comments. Therefore, the EPA is finalizing the approval of these revisions to the SIP.
II. Have the requirements for approval of a SIP revision been met?
The States submission has met the public notice requirements for SIP
submissions in accordance with 40 CFR
51.102. The submission also satisfied the completeness criteria of 40 CFR part 51, appendix V. The State provided public notice on this SIP revision from July 29, 2019, through September 13, 2019, and received one comment from the Missouri Petroleum Marketers and Convenience Store Association, one comment from Abel Realty, and thirteen comments from EPA. After receiving comments, the State revised the SIP
prior to submitting the plan to EPA. In addition, as explained above and in more detail in the Missouri submittal document, which is part of the docket, the revision meets the substantive SIP
requirements of the CAA, including section 110 and implementing regulations.
III. What action is the EPA taking?
The EPA is taking final action to approve a SIP revision submitted by the State of Missouri on November 12, 2019, revising the 1997 PM2.5 maintenance plan. EPA has determined that this revision does not interfere with attainment or maintenance of the NAAQS or with any other CAA
requirement.
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. 7410k; 40 CFR 52.02a.
Thus, in reviewing SIP submissions, the
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