Open for CommentEPA· Environmental Protection AgencyProposed Rule

Air Quality State Implementation Plans; Approvals and Promulgations: Arizona; Attainment Plan for the Hayden SO2 Nonattainment Area for the 1971 and 2010 Sulfur Dioxide National Ambient Air Quality Standards

Introduced March 4, 2026Comment period ends April 4, 2026View on regulations.gov ↗
💬 Closes in 16 daysDeadline: Apr 4, 2026

What This Means

The EPA is approving Arizona's plan to reduce sulfur dioxide pollution in the Hayden area to meet federal air quality standards that have been in place since 1971 and updated in 2010. This plan affects people living and working in the Hayden area, as well as industrial facilities like smelters that release this pollutant, and it matters because sulfur dioxide can cause serious respiratory problems and other health issues, especially for children and people with asthma. Arizona's plan sets specific pollution reduction targets and timelines to bring the air quality up to levels the federal government considers safe for public health.

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Details

TypeFederal Regulation
AgencyEPA · Environmental Protection Agency
Regulations.gov IDEPA-R09-OAR-2025-3821-0001
IntroducedMarch 4, 2026
Comment DeadlineApril 4, 2026

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