# Approval and Promulgation of Implementation Plans and Designations of Areas for Air Quality Planning Purposes; Missouri and Illinois; St. Louis; Determination of Attainment by Applicable Attainment Date for the 1997 Ozone National Ambient Air Quality Standard (NAAQS)
> **Rule** · Final rule. · Published 2012-04-30 · Effective 2012-05-30 · 77 FR 25363
## Document
- **Document number:** 2012-10207
- **Category:** air-emissions
- **Federal Register citation:** 77 FR 25363
- **CFR reference:** 40 CFR 52
- **Publication date:** 2012-04-30
- **Effective date:** 2012-05-30
- **State:** IL
- **EPA docket:** EPA-R07-OAR-2012-0053
## Abstract

EPA is taking final action to determine, pursuant to the Clean Air Act (CAA), that the bi-state St. Louis (MO-IL) ozone nonattainment area ("St. Louis area") attained the 1997 8-hour ozone National Ambient Air Quality Standards (NAAQS) by the applicable attainment date of June 15, 2010. This determination is based upon complete, quality- assured, and certified ambient air quality data from the 2007-2009 monitoring period which show that the St. Louis area has monitored attainment of the 1997 8-hour ozone NAAQS as of the applicable date.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2012/04/30/2012-10207/approval-and-promulgation-of-implementation-plans-and-designations-of-areas-for-air-quality-planning)
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