# Approval of Implementation Plans of Michigan: Clean Air Interstate Rule
> **Rule** · Final rule. · Published 2007-12-20 · Effective 2007-12-20 · 72 FR 72256
## Document
- **Document number:** E7-24513
- **Category:** air-emissions
- **Federal Register citation:** 72 FR 72256
- **CFR reference:** 40 CFR 52
- **Publication date:** 2007-12-20
- **Effective date:** 2007-12-20
- **State:** MI
- **EPA docket:** EPA-R05-OAR-2007-0519
## Abstract

EPA is conditionally approving a revision to the Michigan State Implementation Plan (SIP) submitted on July 16, 2007. This revision incorporates provisions related to the implementation of EPA's Clean Air Interstate Rule (CAIR), promulgated on May 12, 2005, and subsequently revised on April 28, 2006, and December 13, 2006, and the CAIR Federal Implementation Plan (CAIR FIP) concerning sulfur dioxide (SO<INF>2</INF>), nitrogen oxides (NO<INF>X</INF>) annual, and NO<INF>X</INF> ozone season emissions for the state of Michigan, promulgated on April 28, 2006, and subsequently revised December 13, 2006. EPA is not making any changes to the CAIR FIP, but is, to the extent EPA approves Michigan's SIP revision, amending the appropriate appendices in the CAIR FIP trading rules simply to note that approval. The SIP revision that EPA is conditionally approving is an abbreviated SIP revision that addresses: The applicability provisions for the NO<INF>X</INF> ozone season trading program under the CAIR FIP and supporting definitions of terms; the methodology to be used to allocate NO<INF>X</INF> annual and ozone season NO<INF>X</INF> allowances under the CAIR FIP and supporting definitions of terms; and provisions for opt-in units under the CAIR FIP. Michigan will be submitting additional SO<INF>2</INF> rules in the future.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2007/12/20/E7-24513/approval-of-implementation-plans-of-michigan-clean-air-interstate-rule)
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