# Approval and Promulgation of Implementation Plans; State of Missouri
> **Rule** · Final rule. · Published 2003-05-12 · Effective 2003-05-12 · 68 FR 25414
## Document
- **Document number:** 03-11186
- **Category:** air-emissions
- **Federal Register citation:** 68 FR 25414
- **CFR reference:** 40 CFR 52
- **Publication date:** 2003-05-12
- **Effective date:** 2003-05-12
- **State:** MO
- **EPA docket:** MO 181-1181
## Abstract

EPA is announcing approval of a revision to the state implementation plan (SIP) for the vehicle inspection and maintenance (I/M) program operating in the Missouri portion of the St. Louis, Missouri, ozone nonattainment area. Missouri made several amendments to the state-adopted I/M rule to improve performance of the program and requested that the SIP be revised. The effect of this action ensures Federal enforceability of the state air program rules and maintains consistency between the state-adopted rules and the approved SIP. EPA proposed approval of this rule in the Federal Register on January 30, 2003 (68 FR 4842). This final action is being published to meet our statutory obligation under the Clean Air Act (CAA or the Act).

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2003/05/12/03-11186/approval-and-promulgation-of-implementation-plans-state-of-missouri)
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