# Air Plan Approval; IA, Muscatine; 2010 1-Hour SO2 Maintenance Plan and Redesignation
> **Rule** · Final rule. · Published 2025-11-18 · Effective 2025-12-18 · 90 FR 51554
## Document
- **Document number:** 2025-20197
- **Category:** air-emissions
- **Federal Register citation:** 90 FR 51554
- **CFR reference:** 40 CFR 52
- **Publication date:** 2025-11-18
- **Effective date:** 2025-12-18
- **EPA docket:** EPA-R07-OAR-2025-0818
## Abstract

The Environmental Protection Agency (EPA) is taking final action to redesignate the nonattainment area in Muscatine County, Iowa to attainment for the 2010 1-hour sulfur dioxide (SO<INF>2</INF>) National Ambient Air Quality Standard (NAAQS). The EPA is also approving Iowa's maintenance plan for the 2010 1-hour SO<INF>2</INF> NAAQS for the Muscatine nonattainment area and approving modifications to source-specific permits in the Iowa State Implementation Plan (SIP). The EPA is taking this action in accordance with the requirements of the Clean Air Act (CAA).

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2025/11/18/2025-20197/air-plan-approval-ia-muscatine-2010-1-hour-so2-maintenance-plan-and-redesignation)
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