# Federal Implementation Plan for the Billings/Laurel, MT, Sulfur Dioxide Area
> **Rule** · Final rule. · Published 2008-04-21 · Effective 2008-05-21 · 73 FR 21418
## Document
- **Document number:** E8-7868
- **Category:** air-emissions
- **Federal Register citation:** 73 FR 21418
- **CFR reference:** 40 CFR 52
- **Publication date:** 2008-04-21
- **Effective date:** 2008-05-21
- **EPA docket:** EPA-R08-OAR-2006-0098
## Abstract

The Environmental Protection Agency (EPA) is promulgating a Federal Implementation Plan (FIP) containing emission limits and compliance determining methods for several sources located in Billings and Laurel, Montana. EPA is promulgating a FIP because of our previous partial and limited disapprovals of the Billings/Laurel Sulfur Dioxide (SO2) State Implementation Plan (SIP). The intended effect of this action is to assure attainment of the SO2 National Ambient Air Quality Standards (NAAQS) in the Billings/Laurel, Montana area. EPA is taking this action under sections 110, 301, and 307 of the Clean Air Act (Act).

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2008/04/21/E8-7868/federal-implementation-plan-for-the-billingslaurel-mt-sulfur-dioxide-area)
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