# Air Plan Approval; Michigan; Sulfur Dioxide Clean Data Determination for St. Clair
> **Rule** · Final rule. · Published 2021-12-07 · Effective 2021-12-07 · 86 FR 69173
## Document
- **Document number:** 2021-26471
- **Category:** air-emissions
- **Federal Register citation:** 86 FR 69173
- **CFR reference:** 40 CFR 52
- **Publication date:** 2021-12-07
- **Effective date:** 2021-12-07
- **State:** MI
- **EPA docket:** EPA-R05-OAR-2020-0385
## Abstract

The Environmental Protection Agency (EPA) is making a determination that the St. Clair sulfur dioxide (SO<INF>2</INF>) nonattainment area has attained the 2010 primary SO<INF>2</INF> National Ambient Air Quality Standard (2010 SO<INF>2</INF> NAAQS). This determination suspends certain planning requirements and sanctions for the nonattainment area for as long as the area continues to attain the 2010 SO<INF>2</INF> NAAQS. EPA proposed this action on August 17, 2021, and received four supportive comments and one set of adverse comments.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2021/12/07/2021-26471/air-plan-approval-michigan-sulfur-dioxide-clean-data-determination-for-st-clair)
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