# Approval and Promulgation of Air Quality Implementation Plans; Montana; Billings/Laurel Sulfur Dioxide State Implementation Plan
> **Rule** · Final rule. · Published 2002-05-02 · Effective 2002-06-03 · 67 FR 22168
## Document
- **Document number:** 02-10332
- **Category:** air-emissions
- **Federal Register citation:** 67 FR 22168
- **CFR reference:** 40 CFR 52
- **Publication date:** 2002-05-02
- **Effective date:** 2002-06-03
- **State:** MT
- **EPA docket:** MT-001-0007, MT-001-0008, MT-001-0009 and MT-001-0010
## Abstract

EPA is partially approving and partially disapproving the Billings/Laurel sulfur dioxide (SO2) State Implementation Plan (SIP) revisions submitted by the State of Montana in response to a SIP Call. EPA is also limitedly approving and limitedly disapproving one provision of the SIP revisions. The SIP revisions establish, and require seven sources to meet and monitor compliance with, SO2 emission limitations and other requirements in the Billings/Laurel area. The intended effect of this action is to make federally enforceable those provisions that EPA is approving and to disapprove those provisions that do not meet applicable requirements. EPA is taking this action under sections 110 and 179 of the Clean Air Act (Act). In a separate action being published today, EPA is proposing action on other provisions of the Billings/Laurel SO2 SIP.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2002/05/02/02-10332/approval-and-promulgation-of-air-quality-implementation-plans-montana-billingslaurel-sulfur-dioxide)
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