# Approval and Promulgation of Maintenance Plans; Michigan; Southeast Michigan Ozone Maintenance Plan Update to the State Implementation Plan
> **Rule** · Direct final rule. · Published 2005-05-20 · Effective 2005-07-19 · 70 FR 29202
## Document
- **Document number:** 05-10150
- **Category:** air-emissions
- **Federal Register citation:** 70 FR 29202
- **CFR reference:** 40 CFR 52
- **Publication date:** 2005-05-20
- **Effective date:** 2005-07-19
- **State:** MI
- **EPA docket:** R05-OAR-2004-MI-0004
## Abstract

EPA is approving a December 19, 2003, request from Michigan to revise the ground level ozone State Implementation Plan (SIP) for the Southeast Michigan area. EPA originally approved the Southeast Michigan ozone maintenance plan on April 6, 1995. This action approves an update to the plan prepared by Michigan to maintain the 1-hour national ambient air quality standard (NAAQS) for ozone in the Southeast Michigan maintenance area through the year 2015. This update is required by the Clean Air Act (CAA).

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2005/05/20/05-10150/approval-and-promulgation-of-maintenance-plans-michigan-southeast-michigan-ozone-maintenance-plan)
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