Data / Federal rules / 2025-05369

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

The Environmental Protection Agency published this proposed rule in the Federal Register on March 31, 2025. Comments closed on April 30, 2025.

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What the agency says

The Environmental Protection Agency (EPA) is proposing 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 proposing to approve the revision under the Clean Air Act (CAA or "Act"). We are taking comments on this proposal and plan to follow with a final action.

Key facts

Document number: 2025-05369
Type: Proposed rule
Action: Proposed rule
Agency: Environmental Protection Agency
Published: March 31, 2025
Comments due: April 30, 2025
Dates: Comments must be received on or before April 30, 2025.
Docket: EPA-R09-OAR-2024-0473; FRL-12323-01-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: 4

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 March 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.