Air Plan Approval; Arizona; Attainment Plan for the Hayden SO2 Nonattainment Area for the 1971 and 2010 Sulfur Dioxide National Ambient Air Quality Standards
What happened
The Environmental Protection Agency (EPA) is finalizing approval of Arizona's state implementation plan (SIP) revisions for the Hayden SO2 nonattainment area. This "Hayden SO2 Plan" addresses requirements under the Clean Air Act for both the 1971 and 2010 sulfur dioxide (SO2) national ambient air quality standards. The EPA is approving these revisions because they meet the Clean Air Act requirements. This rule is effective September 21, 2026.
Why it matters
This action aims to improve air quality in the Hayden, Arizona area by reducing sulfur dioxide emissions. It ensures Arizona meets federal clean air standards for this pollutant. The plan addresses elements like emissions limitations, control measures, and progress toward attainment.
Who it affects
- ›Residents in the Hayden SO2 nonattainment area
- ›ASARCO LLC (owner of Hayden copper smelter)
- ›Arizona Department of Environmental Quality (ADEQ)
- ›The Environmental Protection Agency (EPA)
The receipts are official. The summary is ours.
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