# Approval and Promulgation of Air Quality Implementation Plans; Illinois
> **Rule** · Direct final rule. · Published 2008-08-04 · Effective 2008-10-03 · 73 FR 45158
## Document
- **Document number:** E8-17699
- **Category:** air-emissions
- **Federal Register citation:** 73 FR 45158
- **CFR reference:** 40 CFR 52
- **Publication date:** 2008-08-04
- **Effective date:** 2008-10-03
- **State:** IL
- **EPA docket:** EPA-R05-OAR-2006-0003
## Abstract

EPA is approving a revision to the Illinois State Implementation Plan (SIP) for ozone. The state is incorporating revisions EPA made to its definition of volatile organic compound (VOC). This SIP revision adds one compound to the list of compounds that are exempt from being considered a VOC. This is because it was determined that the listed compound does not significantly contribute to ozone formation.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2008/08/04/E8-17699/approval-and-promulgation-of-air-quality-implementation-plans-illinois)
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