Data / Federal rules / 2026-18755

Clean Data Determination; 1997 8-Hour Ozone Standards; California; Sacramento Metro Area

The Environmental Protection Agency published this proposed rule in the Federal Register on September 14, 2026. Comments closed on October 14, 2026.

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What the agency says

The U.S. Environmental Protection Agency (EPA or "Agency") is proposing to issue a clean data determination (CDD) for the Sacramento Metro, California nonattainment area to reflect our finding that the area is attaining the 1997 8-hour ozone national ambient air quality standards (NAAQS or "standards"). This finding is based on quality-assured and certified ambient air quality monitoring data from 2023 through 2025. If we finalize this CDD, certain Clean Air Act (CAA) requirements that apply to the Sacramento Metro area will be suspended for so long as the area continues to attain the 1997 8-hour ozone NAAQS. We are taking comments on this proposal and plan to follow with a final action.

Key facts

Document number: 2026-18755
Type: Proposed rule
Action: Proposed determination
Agency: Environmental Protection Agency
Published: September 14, 2026
Comments due: October 14, 2026
Dates: Comments must be received on or before October 14, 2026.
Docket: EPA-R09-OAR-2026-4885; FRL-13450-01-R9
Code of Federal Regulations: 40 CFR 52
Topics: Air pollution control; Environmental protection; Incorporation by reference; Intergovernmental relations; Nitrogen oxides; Reporting and recordkeeping requirements; Volatile organic compounds
Pages: 7

The document on federalregister.gov PDF

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Everything from the Environmental Protection Agency · Rules on air pollution control · Rules on environmental protection · Rules on incorporation by reference · Published in September 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.