# Approval and Promulgation of Implementation Plans; Designation of Areas for Air Quality Planning Purposes; State of Missouri
> **Rule** · Direct final rule. · Published 1999-01-26 · Effective 1999-03-29 · 64 FR 3855
## Document
- **Document number:** 99-1332
- **Category:** air-emissions
- **Federal Register citation:** 64 FR 3855
- **CFR reference:** 40 CFR 52
- **Publication date:** 1999-01-26
- **Effective date:** 1999-03-29
- **State:** MO
- **EPA docket:** MO 043-1043(a)
## Abstract

In this action, the EPA is promulgating a redesignation request and State Implementation Plan (SIP) revision submitted by the state of Missouri on June 13, 1997. Additional material was sent on June 15, 1998. The request is to redesignate the portion of the St. Louis metropolitan area, currently a carbon monoxide (CO) nonattainment area, to a CO attainment area. Under the Clean Air Act (CAA) as amended in 1990, a redesignation to attainment may be promulgated if the state demonstrates full compliance with the redesignation requirements set forth in section 107(d)(3)(E). In this action, the EPA is also approving Missouri's SIP revision regarding the state's CO maintenance plan.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/1999/01/26/99-1332/approval-and-promulgation-of-implementation-plans-designation-of-areas-for-air-quality-planning)
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