# Approval and Promulgation of Air Quality Implementation Plans; Illinois and Indiana; Finding of Attainment for 1-Hour Ozone for the Chicago-Gary-Lake County, IL-IN Area
> **Rule** · Final rule. · Published 2008-12-30 · Effective 2009-01-29 · 73 FR 79652
## Document
- **Document number:** E8-30812
- **Category:** air-emissions
- **Federal Register citation:** 73 FR 79652
- **CFR reference:** 40 CFR 52
- **Publication date:** 2008-12-30
- **Effective date:** 2009-01-29
- **State:** IL
- **EPA docket:** EPA-R05-OAR-2007-1044, EPA-R05-OAR-2007-1133
## Abstract

EPA is approving a January 30, 2007, request from the Illinois Environmental Protection Agency (IEPA) that EPA find that the Illinois portion of the Chicago-Gary-Lake County, Illinois-Indiana (IL-IN) nonattainment area, has attained the revoked 1-hour ozone National Ambient Air Quality Standard (NAAQS). EPA is also approving an October 25, 2007, request from the Indiana Department of Environmental Management (IDEM) that EPA find that the Indiana portion of the Chicago-Gary-Lake County, IL-IN nonattainment area, has attained the revoked 1-hour ozone NAAQS. EPA proposed to approve both requests on July 7, 2008. We received three comments on our proposed rulemaking, which are addressed below.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2008/12/30/E8-30812/approval-and-promulgation-of-air-quality-implementation-plans-illinois-and-indiana-finding-of)
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