# Designation of Areas for Air Quality Planning Purposes; Redesignation Request and Associated Maintenance Plan for Billings, MT 2010 SO2 Nonattainment Area
> **Rule** · Final rule. · Published 2016-05-10 · Effective 2016-06-09 · 81 FR 28718
## Document
- **Document number:** 2016-10451
- **Category:** air-emissions
- **Federal Register citation:** 81 FR 28718
- **CFR reference:** 40 CFR 52
- **Publication date:** 2016-05-10
- **Effective date:** 2016-06-09
- **EPA docket:** EPA-R08-OAR-2015-0205
## Abstract

The Environmental Protection Agency (EPA) is approving the State of Montana's request to redesignate the Billings sulfur dioxide (SO<INF>2</INF>) nonattainment area to attainment for the 2010 SO<INF>2</INF> primary national ambient air quality standards (NAAQS). The EPA has determined that the Billings SO<INF>2</INF> nonattainment area is attaining the 2010 SO<INF>2</INF> primary NAAQS. In addition, the EPA is approving Montana's maintenance plan which provides for continued attainment of the 2010 SO<INF>2</INF> primary NAAQS in the area. These actions are being taken under the Clean Air Act (CAA).

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2016/05/10/2016-10451/designation-of-areas-for-air-quality-planning-purposes-redesignation-request-and-associated)
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