Data / Federal rules / 2025-17061

Air Plan Approval; California; State Implementation Plan Revision for Chico, Modesto and Stockton Carbon Monoxide Maintenance Areas

The Environmental Protection Agency published this final rule in the Federal Register on September 5, 2025. It took effect on October 6, 2025.

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What the agency says

The Environmental Protection Agency (EPA) is taking final action to approve a revision to the California state implementation plan (SIP) that removes carbon monoxide (CO) contingency measures and monitoring requirements from the maintenance plan for three CO maintenance areas: Chico Urbanized Area, Modesto Urbanized Area, and Stockton Urbanized Area. We are approving the revision under the Clean Air Act (CAA or "Act").

Key facts

Document number: 2025-17061
Type: Final rule
Action: Final rule
Agency: Environmental Protection Agency
Published: September 5, 2025
Takes effect: October 6, 2025
Dates: This rule is effective October 6, 2025.
Docket: EPA-R09-OAR-2024-0473; FRL-12323-02-R9
Code of Federal Regulations: 40 CFR 52
Topics: Air pollution control; Carbon monoxide; Environmental protection; Incorporation by reference; Intergovernmental relations; Reporting and recordkeeping requirements
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 carbon monoxide · Rules on environmental protection · Published in September 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.