Loading
Loading
Your feedback directly shapes Sporos.
Sign in to track your feedback history
The Environmental Protection Agency (EPA) is proposing to approve revisions to the Arizona state implementation plan (SIP) for attaining the 1971 and 2010 sulfur dioxide (SO<INF>2</INF>) national ambient air quality standards (NAAQS or "standards") in the Hayden SO<INF>2</INF> nonattainment area. These SIP revisions, collectively referred to as the "Hayden SO<INF>2</INF> Plan" or "Plan," include Arizona's attainment demonstration and other elements required under Clean Air Act (CAA or "Act") sections 110, 172, 191, and 192. In addition to an attainment demonstration, the revisions address the requirements for meeting reasonable further progress (RFP) toward attainment of the NAAQS, reasonably available control measures and reasonably available control technology (RACM/RACT), base-year and projection-year emissions inventories, nonattainment new source review (NSR), emissions limitations necessary to provide for attainment, and contingency measures. The EPA is proposing to approve the SIP revisions as meeting the CAA requirements. This action is being taken under the CAA. We are taking comments on this proposal and plan to follow with a final action.
Published
Mar 4, 2026
Comments Close
Apr 3, 2026(23d)
Citation
91 FR 10531
Agencies
1
23 days remaining — closes Apr 3, 2026.
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.
No document text available yet
EPA-R09-OAR-2025-3821
FRL-13144-01-R9
40 CFR 52