Data / Federal rules / 2025-15989

Air Plan Approval; California; Revised Format for Materials Incorporated by Reference

The Environmental Protection Agency published this final rule in the Federal Register on August 21, 2025. It took effect on August 21, 2025.

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What the agency says

The Environmental Protection Agency (EPA) is revising the format for materials submitted by the State of California that are incorporated by reference into the California State Implementation Plan (SIP). The regulations and other materials affected by this format change have all been previously submitted by the State of California and approved by the EPA. This format revision will primarily affect the "Identification of plan--in part" sections, as well as the format of the SIP materials that will be available for public inspection at the EPA Regional Office and the National Archives and Records Administration (NARA). This action, which only relates to source- specific requirements and certain local and regional California air district rules, is the fourth of a series of actions intended to change the format for the entire California SIP.

Key facts

Document number: 2025-15989
Type: Final rule
Action: Final rule; administrative change
Agency: Environmental Protection Agency
Published: August 21, 2025
Takes effect: August 21, 2025
Dates: This rule is effective on August 21, 2025.
Docket: EPA-R09-OAR-2024-0527; FRL-12812-01-R9
Code of Federal Regulations: 40 CFR 52
Topics: Air pollution control; Carbon oxides; Environmental protection; Incorporation by reference; Intergovernmental relations; Lead; Nitrogen oxides; Ozone; Particulate matter; Reporting and recordkeeping requirements; Sulfur oxides; Volatile organic compounds
Pages: 61

The document on federalregister.gov PDF

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Everything from the Environmental Protection Agency · Rules on air pollution control · Rules on carbon oxides · Rules on environmental protection · Published in August 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.