Data / Federal rules / 2026-01766

Determination of Attainment by the Attainment Date and Clean Data Determination; California, San Joaquin Valley 1997 Annual PM2.5 Fine Particulate Matter Nonattainment Area

The Environmental Protection Agency published this final rule in the Federal Register on January 29, 2026. It took effect on March 2, 2026.

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What the agency says

The Environmental Protection Agency (EPA) is finalizing our determination that the San Joaquin Valley, California, fine particulate matter (PM<INF>2.5</INF>) nonattainment area attained the 1997 annual PM<INF>2.5</INF> national ambient air quality standards (NAAQS) by the December 31, 2024 applicable attainment date. This determination is based on ambient air quality monitoring data from 2022 through 2024. We are also making a clean data determination (CDD) based on the 2022 through 2024 data and our evaluation of preliminary air quality monitoring data from 2025.

Key facts

Document number: 2026-01766
Type: Final rule
Action: Final rule
Agency: Environmental Protection Agency
Published: January 29, 2026
Takes effect: March 2, 2026
Dates: This rule is effective March 2, 2026.
Docket: EPA-R09-OAR-2025-0292; FRL-12825-02-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: 3

The document on federalregister.gov PDF

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Everything from the Environmental Protection Agency · Rules on air pollution control · Rules on ammonia · Rules on environmental protection · Published in January 2026

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.