# Approval and Promulgation of Implementation Plans; States of Illinois and Missouri; 1-Hour Ozone Attainment Demonstrations, Motor Vehicle Emissions Budgets, Reasonably Available Control Measures, Contingency Measures, Attainment Date Extension, and Withdrawal of Nonattainment Determination and Reclassification
> **Rule** · Final rule. · Published 2001-06-26 · Effective 2001-06-26 · 66 FR 33996
## Document
- **Document number:** 01-15842
- **Category:** air-emissions
- **Federal Register citation:** 66 FR 33996
- **CFR reference:** 40 CFR 52
- **Publication date:** 2001-06-26
- **Effective date:** 2001-06-26
- **State:** IL
- **EPA docket:** Tracking No. MO-0132-1132, IL 196-3
## Abstract

Pursuant to the Clean Air Act (Act), EPA is approving the Illinois and Missouri 1-hour ozone attainment demonstration State Implementation Plans (SIP) for the St. Louis moderate ozone nonattainment area. In conjunction with its approval of the attainment demonstration, EPA is: extending the ozone attainment date for the St. Louis ozone nonattainment area to November 15, 2004, while retaining the area's current classification as a moderate ozone nonattainment area; withdrawing EPA's March 19, 2001, rulemaking determining nonattainment and reclassification of the St. Louis ozone nonattainment area; finding that the St. Louis ozone nonattainment area meets the reasonably available control measures (RACM) requirements of the Act; finding that the contingency measures identified by the states of Illinois and Missouri are adequate; approving the Illinois and Missouri motor vehicle emissions budgets (MVEB); and approving an exemption from the oxides of nitrogen ( NO<INF>X</INF>) emission control requirements for reasonably available control technology (RACT) and disapproving an exemption from the NO<INF>X</INF> new source review (NSR) and NO<INF>X</INF> conformity requirements for the Illinois portion of the St. Louis ozone nonattainment area.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2001/06/26/01-15842/approval-and-promulgation-of-implementation-plans-states-of-illinois-and-missouri-1-hour-ozone)
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