# Air Plan Approval; Iowa; Determination of Attainment by the Attainment Date for the 2010 1-Hour Sulfur Dioxide Standard
> **Rule** · Final rule. · Published 2022-04-07 · Effective 2022-05-09 · 87 FR 20329
## Document
- **Document number:** 2022-07291
- **Category:** air-emissions
- **Federal Register citation:** 87 FR 20329
- **CFR reference:** 40 CFR 52
- **Publication date:** 2022-04-07
- **Effective date:** 2022-05-09
- **State:** IA
- **EPA docket:** EPA-R07-OAR-2021-0932
## Abstract

The Environmental Protection Agency (EPA) is taking final action to determine that the Muscatine sulfur dioxide (SO<INF>2</INF>) nonattainment area attained the 2010 1-hour SO<INF>2</INF> primary national ambient air quality standard (NAAQS) by the applicable attainment date of October 4, 2018, based upon a weight-of-evidence analysis using available air quality information. Additional analysis of the attainment determination is provided in a Technical Support Document (TSD) included in the docket to this rulemaking. This action addresses the EPA's obligation under a consent decree which established a deadline of March 31, 2022 for the EPA to determine under Clean Air Act (CAA) section 179(c) whether the Muscatine SO<INF>2</INF> nonattainment area attained the NAAQS by the October 4, 2018, attainment date. The consent decree deadline was extended to June 30, 2022.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2022/04/07/2022-07291/air-plan-approval-iowa-determination-of-attainment-by-the-attainment-date-for-the-2010-1-hour-sulfur)
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