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Air Plan Approval; Missouri; Moderate Attainment Plan Elements for the 2015 8-Hour Ozone Standard for the Missouri Portion of the St. Louis Nonattainment Area

The Environmental Protection Agency (EPA) is proposing to approve portions of a state implementation plan (SIP) revision submitted by the State of Missouri on September 6, 2023, as meeting Clean Air Act (CAA) requirements for the 2015 8-hour ozone national ambient air quality standards (NAAQS) in the Missouri portion of the St. Louis, MO-IL bi-state nonattainment area. Specifically, the EPA is proposing approval of the submitted vehicle inspection and maintenance (I/M) program, nonattainment new source review (NNSR) program, and reasonably available control technology (RACT) determinations for major sources of volatile organic compounds (VOC) and Nitrogen Oxides (NO<INF>X</INF>) SIP elements as meeting applicable Moderate nonattainment area requirements for the 2015 8-hour ozone NAAQS. The EPA will address the remaining SIP elements in a separate action.

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The Environmental Protection Agency (EPA) is proposing to approve portions of a state implementation plan (SIP) revision submitted by the State of Missouri on September 6, 2023, as meeting Clean Air Act (CAA) requirements for the 2015 8-hour ozone national ambient air quality standards (NAAQS) in the Missouri portion of the St. Louis, MO-IL bi-state nonattainment area. Specifically, the EPA is proposing approval of the submitted vehicle inspection and maintenance (I/M) program, nonattainment new source review (NNSR) program, and reasonably available control technology (RACT) determinations for major sources of volatile organic compounds (VOC) and Nitrogen Oxides (NO<INF>X</INF>) SIP elements as meeting applicable Moderate nonattainment area requirements for the 2015 8-hour ozone NAAQS. The EPA will address the remaining SIP elements in a separate action.

Source

https://www.federalregister.gov/documents/2026/08/14/2026-16571/air-plan-approval-missouri-moderate-attainment-plan-elements-for-the-2015-8-hour-ozone-standard-for

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