# Approval and Promulgation of Determination of Attainment for the 1997 8-Hour Ozone Standard: States of Missouri and Illinois
> **Rule** · Final rule. · Published 2011-06-09 · Effective 2011-07-11 · 76 FR 33647
## Document
- **Document number:** 2011-14296
- **Category:** air-emissions
- **Federal Register citation:** 76 FR 33647
- **CFR reference:** 40 CFR 52
- **Publication date:** 2011-06-09
- **Effective date:** 2011-07-11
- **State:** IL
- **EPA docket:** EPA-R07-OAR-2010-0416
## Abstract

The Environmental Protection Agency (EPA) is taking final action to determine that the St. Louis (MO-IL) metropolitan nonattainment area has attained the 1997 8-hour National Ambient Air Quality Standard (NAAQS) for ozone. The St. Louis metropolitan ozone nonattainment area includes the counties of Franklin, Jefferson, St. Charles, and St. Louis as well as St. Louis City in Missouri; and the counties of Madison, Monroe, St. Clair, and Jersey in Illinois. This final determination is based on three years of complete, quality assured ambient air quality monitoring data for Missouri and Illinois for the 2008 through 2010 ozone seasons showing attainment of the NAAQS at all ozone monitoring sites in the nonattainment area. Based on this final determination, the obligation to submit certain ozone attainment demonstration requirements, along with other requirements related to the attainment of the 1997 8-hour ozone standard are suspended.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2011/06/09/2011-14296/approval-and-promulgation-of-determination-of-attainment-for-the-1997-8-hour-ozone-standard-states)
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