# Air Plan Approval; Arizona; Attainment Plan for the Hayden SO2 Nonattainment Area for the 1971 and 2010 Sulfur Dioxide National Ambient Air Quality Standards

> **EPA** · Rulemaking · Modified 2026-04-06T13:29:17Z

## Docket
- **Docket ID:** EPA-R09-OAR-2025-3821
- **Agency:** EPA
- **Type:** Rulemaking
- **Last modified:** 2026-04-06T13:29:17Z

## Source
- [regulations.gov docket](https://www.regulations.gov/docket/EPA-R09-OAR-2025-3821)
- [Public comments](https://www.regulations.gov/docket/EPA-R09-OAR-2025-3821/comments)

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