Data / Federal rules / 2025-12856

Finding of Failure To Attain the 1997 8-Hour Ozone Standards; California; San Joaquin Valley

The Environmental Protection Agency published this proposed rule in the Federal Register on July 10, 2025. Comments closed on August 11, 2025.

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What the agency says

The Environmental Protection Agency (EPA) is proposing to determine that the San Joaquin Valley, California area failed to attain the 1997 8-hour ozone national ambient air quality standard by its June 15, 2024 "Extreme" area attainment date. This proposed determination is based on quality-assured and certified ambient air quality monitoring data from 2021 through 2023.

Key facts

Document number: 2025-12856
Type: Proposed rule
Action: Proposed determination
Agency: Environmental Protection Agency
Published: July 10, 2025
Comments due: August 11, 2025
Dates: Comments must be received on or before August 11, 2025.
Docket: EPA-R09-OAR-2024-0587; FRL-12483-01-R9
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: 5

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 July 2025

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.