# Determination of Attainment, Approval and Promulgation of Air Quality Implementation Plans; Indiana
> **Rule** · Final rule. · Published 2010-03-12 · Effective 2010-04-12 · 75 FR 12088
## Document
- **Document number:** 2010-5110
- **Category:** air-emissions
- **Federal Register citation:** 75 FR 12088
- **CFR reference:** 40 CFR 52
- **Publication date:** 2010-03-12
- **Effective date:** 2010-04-12
- **State:** IN
- **EPA docket:** EPA-R05-OAR-2009-0512
## Abstract

EPA is taking several related actions under the Clean Air Act (CAA) affecting the Indiana portion (Lake and Porter Counties) of the Chicago-Gary-Lake County, Illinois-Indiana (IL-IN) 1997 eight-hour ozone nonattainment area. First, EPA is making a determination that this area has attained the 1997 eight-hour ozone National Ambient Air Quality Standard (NAAQS). In addition, EPA is approving a request from the State of Indiana to exempt sources of Nitrogen Oxides (NO<INF>X</INF>) in Lake and Porter Counties from CAA Reasonably Available Control Technology (RACT) requirements.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2010/03/12/2010-5110/determination-of-attainment-approval-and-promulgation-of-air-quality-implementation-plans-indiana)
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