Data / Federal rules / 2026-06441
Finding of Failure To Attain the 2006 24-Hour PM2.5 Standards; California; San Joaquin Valley; Error Correction
The Environmental Protection Agency published this proposed rule in the Federal Register on April 2, 2026. Comments closed on May 4, 2026.
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What the agency says
In response to a court decision, the Environmental Protection Agency (EPA) is proposing to correct our July 22, 2020 final action erroneously granting a Clean Air Act (CAA or "Act") section 188(e) attainment date extension for the 2006 24-hour fine particulate matter (PM<INF>2.5</INF>) national ambient air quality standards (NAAQS or "standards") in the San Joaquin Valley from December 31, 2019, to December 31, 2024, and is now proposing to deny California's extension request. The EPA is also proposing to determine that the San Joaquin Valley nonattainment area failed to attain the 2006 24-hour PM<INF>2.5</INF> NAAQS by the December 31, 2019 unextended attainment date. This proposed determination is based upon monitored air quality data from 2017 through 2019. If the EPA finalizes this determination as proposed, the State of California will be required to submit a revision to the California state implementation plan (SIP) that, among other elements, provides for expeditious attainment of the 2006 24-hour PM<INF>2.5</INF> NAAQS and for a five percent annual reduction in emissions of direct PM<INF>2.5</INF> or a PM<INF>2.5</INF> plan precursor pollutant.
Key facts
- Document number
- 2026-06441
- Type
- Proposed rule
- Action
- Proposed rule
- Agency
- Environmental Protection Agency
- Published
- April 2, 2026
- Comments due
- May 4, 2026
- Dates
- Comments must be received on or before May 4, 2026.
- Docket
- EPA-R09-OAR-2026-1257; FRL-13247-01-R9
- Code of Federal Regulations
- 40 CFR 52
- Topics
- Air pollution control; Ammonia; Environmental protection; Incorporation by reference; Intergovernmental relations; Nitrogen oxides; Particulate matter; Reporting and recordkeeping requirements; Sulfur oxides; Volatile organic compounds
- Pages
- 8
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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.