Data / Federal rules / 2026-03846
Air Plan Approval; Illinois; Clean Data Determination for the Illinois Portion of the St. Louis Area for the 2015 Ozone Standard
The Environmental Protection Agency published this proposed rule in the Federal Register on February 26, 2026. Comments closed on March 30, 2026.
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What the agency says
The Environmental Protection Agency (EPA) is proposing to determine under the Clean Air Act (CAA) that the Illinois portion of the St. Louis, MO-IL nonattainment area (hereafter also referred to, respectively, as the "St. Louis area" or "area") has attained the 2015 ozone National Ambient Air Quality Standards (NAAQS or standard). This determination is based upon complete, quality-assured, and certified ambient air monitoring data for the 2023-2025 design value period showing that the Illinois portion of the area achieved attainment of the 2015 ozone NAAQS. This determination also relies on the EPA concurrence of an exceptional events request submitted by the Illinois Environmental Protection Agency (Illinois EPA) on December 18, 2025, and concurred on by the EPA on January 12, 2026. Therefore, the EPA is proposing to take final agency action on Illinois' exceptional events request. In a separate action, the EPA is proposing a similar determination for the Missouri portion of the St. Louis area. If finalized, this determination would suspend the requirements for the area to submit attainment demonstrations and associated Reasonably Available Control Measures (RACM), Reasonable Further Progress (RFP) plans, contingency measures for failure to attain or make reasonable progress, and other planning State Implementation Plans (SIPs) related to attainment of the 2015 ozone NAAQS, for as long as the area continues to attain the 2015 ozone NAAQS.
Key facts
- Document number
- 2026-03846
- Type
- Proposed rule
- Action
- Proposed rule
- Agency
- Environmental Protection Agency
- Published
- February 26, 2026
- Comments due
- March 30, 2026
- Dates
- Comments must be received on or before March 30, 2026.
- Docket
- EPA-R05-OAR-2026-0695; FRL-13224-01-R5
- Code of Federal Regulations
- 40 CFR 52
- Topics
- Air pollution control; Environmental protection; Incorporation by reference; Intergovernmental relations; Nitrogen oxides; Ozone; Reporting and recordkeeping requirements; Volatile organic compounds
- Pages
- 4
Other documents from the Environmental Protection Agency
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Read from the Federal Register API, last updated 2026-10-23. The document on federalregister.gov is the official record; dates and dockets can change through later corrections. Free to reuse with credit to SpecStream under CC BY 4.0.