# Approval and Promulgation of Implementation Plan; Michigan
> **Rule** · Final rule. · Published 1997-09-26 · Effective 1997-10-27 · 62 FR 50512
## Document
- **Document number:** 97-25501
- **Category:** air-emissions
- **Federal Register citation:** 62 FR 50512
- **CFR reference:** 40 CFR 52
- **Publication date:** 1997-09-26
- **Effective date:** 1997-10-27
- **State:** MI
- **EPA docket:** MI12-01-7266
## Abstract

On June 12, 1997, the Environmental Protection Agency (EPA) published an action of proposed rulemaking discussing its decision to approve a revision to the Michigan State Implementation Plan (SIP) to grant an exemption for the Muskegon County ozone nonattainment area from the applicable Oxides of Nitrogen (NO<INF>X</INF>) transportation conformity requirements. See Federal Register (62 FR 32058). No comments were received by the EPA during the 30-day comment period. This rule finalizes EPA's decision to approve the exemption for Muskegon County, moderate ozone nonattainment area, from the transportation conformity requirements for NO<INF>X</INF>. The Michigan SIP revision request is based on the urban airshed modeling (UAM) conducted for the attainment demonstration for the Lake Michigan Ozone Study (LMOS) modeling domain. Additional information is available at the address indicated below.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/1997/09/26/97-25501/approval-and-promulgation-of-implementation-plan-michigan)
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