# Approval and Promulgation of Implementation Plans; State of Missouri
> **Rule** · Final rule. · Published 2004-01-13 · Effective 2004-02-12 · 69 FR 1921
## Document
- **Document number:** 04-559
- **Category:** air-emissions
- **Federal Register citation:** 69 FR 1921
- **CFR reference:** 40 CFR 52
- **Publication date:** 2004-01-13
- **Effective date:** 2004-02-12
- **State:** MO
- **EPA docket:** MO 201-1201
## Abstract

The EPA is announcing the approval of a revision to the maintenance plan prepared by Missouri to maintain the 1-hour national ambient air quality standard (NAAQS) for ozone in the Missouri portion of the Kansas City maintenance area through the year 2012. This maintenance plan is applicable to Clay, Jackson and Platte Counties. This revision is required by the Clean Air Act. A similar final action pertaining to the Kansas portion of the Kansas City maintenance area is being done in conjunction with this rulemaking. The effect of this approval is to ensure Federal enforceability of the State air program plan and to maintain consistency between the State-adopted plan and the approved SIP.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2004/01/13/04-559/approval-and-promulgation-of-implementation-plans-state-of-missouri)
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