# Air Plan Approval; Illinois; Plan Elements for the Chicago Nonattainment Area for the 2008 Ozone Standard
> **Rule** · Final rule. · Published 2020-08-19 · Effective 2020-09-18 · 85 FR 50955
## Document
- **Document number:** 2020-16246
- **Category:** air-emissions
- **Federal Register citation:** 85 FR 50955
- **CFR reference:** 40 CFR 52
- **Publication date:** 2020-08-19
- **Effective date:** 2020-09-18
- **State:** IL
- **EPA docket:** EPA-R05-OAR-2019-0031
## Abstract

The Environmental Protection Agency (EPA) is approving a revision to the Illinois State Implementation Plan (SIP) to meet the base year emissions inventory and motor vehicle inspection and maintenance (I/M) requirements of the Clean Air Act (CAA) for the Illinois portion of the Chicago-Naperville, Illinois-Indiana-Wisconsin area (Chicago area) for the 2008 ozone national ambient air quality standard (NAAQS or standard). EPA is approving the State's submission as a SIP revision pursuant to section 110 and part D of the CAA and EPA's regulations because it satisfies the emissions inventory and I/M requirements for areas classified as moderate nonattainment for the 2008 ozone NAAQS. Final approval of the Illinois SIP as meeting the I/M requirements of the CAA for the 2008 ozone NAAQS permanently stops the Federal Implementation Plan (FIP) clock for that element, which was triggered by EPA's December 11, 2017 finding that Illinois failed to submit certain required SIP elements for the 2008 ozone NAAQS. EPA proposed to approve this action on April 23, 2020 and received no adverse comments on the emissions inventory and I/M SIP elements.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2020/08/19/2020-16246/air-plan-approval-illinois-plan-elements-for-the-chicago-nonattainment-area-for-the-2008-ozone)
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