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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).
Published
Dec 18, 2025
Effective
Jan 20, 2026
Citation
90 FR 59051
Agencies
1
Full text not available in our database.
View on Federal Register →Get a plain-English explanation of what this regulation does, which agencies are responsible, and how it affects existing rules.
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EPA-R09-OAR-2023-0539
FRL-11747-02-R9
40 CFR 52
40 CFR 81