Data / Federal rules / 2025-23259

Air Plan Approval: Arizona: Infrastructure Requirements for the 2012 Fine Particulate Matter National Ambient Air Quality Standard

The Environmental Protection Agency published this final rule in the Federal Register on December 18, 2025. It took effect on January 20, 2026.

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What the agency says

The Environmental Protection Agency (EPA) is taking final action to approve portions of the state implementation plan (SIP) revisions submitted by the State of Arizona pursuant to the Clean Air Act (CAA) for the implementation, maintenance, and enforcement of the 2012 fine particulate matter (PM<INF>2.5</INF>) national ambient air quality standards (NAAQS or "standards") as proposed, except for certain requirements related to prevention of significant deterioration (PSD), which EPA will defer action on until a later date. In addition, the EPA is approving regulatory provisions into the Arizona SIP and is amending regulatory text to include La Paz County as part of Mohave- Yuma Intrastate air quality control region (AQCR).

Key facts

Document number: 2025-23259
Type: Final rule
Action: Final rule
Agency: Environmental Protection Agency
Published: December 18, 2025
Takes effect: January 20, 2026
Dates: This rule is effective January 20, 2026.
Docket: EPA-R09-OAR-2023-0539; FRL-11747-02-R9
Code of Federal Regulations: 40 CFR 52; 40 CFR 81
Topics: Air pollution control; Environmental protection; Incorporation by reference; Intergovernmental relations; Nitrogen dioxide; Particulate matter; 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 December 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.