# Air Plan Approval; Michigan; Revisions to Part 9 Miscellaneous Rules
> **Rule** · Final rule. · Published 2018-07-19 · Effective 2018-08-20 · 83 FR 34050
## Document
- **Document number:** 2018-15339
- **Category:** air-emissions
- **Federal Register citation:** 83 FR 34050
- **CFR reference:** 40 CFR 52
- **Publication date:** 2018-07-19
- **Effective date:** 2018-08-20
- **State:** MI
- **EPA docket:** EPA-R05-OAR-2017-0100
## Abstract

The Environmental Protection Agency (EPA) is approving a request submitted by the Michigan Department of Environmental Quality (MDEQ) on February 2, 2017, and supplemented on November 8, 2017, to revise the Michigan state implementation plan (SIP) for carbon monoxide (CO). The revision incorporates changes to Michigan's Air Pollution Control Rules entitled "Emissions Limitations and Prohibitions-- Miscellaneous." The revision updates existing source-specific rule requirements for ferrous cupola operations by removing obsolete rule language and makes a minor change to correct the citation to a Federal test method. The revision continues to result in attainment of the CO national ambient air quality standard.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2018/07/19/2018-15339/air-plan-approval-michigan-revisions-to-part-9-miscellaneous-rules)
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