# Approval and Promulgation of Air Quality Implementation Plans; Illinois; Revision to the Chicago 8-Hour Ozone Maintenance Plan
> **Rule** · Final rule. · Published 2014-10-06 · Effective 2014-11-05 · 79 FR 60073
## Document
- **Document number:** 2014-23795
- **Category:** air-emissions
- **Federal Register citation:** 79 FR 60073
- **CFR reference:** 40 CFR 52
- **Publication date:** 2014-10-06
- **Effective date:** 2014-11-05
- **State:** IL
- **EPA docket:** EPA-R05-OAR-2014-0274
## Abstract

The Environmental Protection Agency (EPA) is approving the State of Illinois' March 28, 2014, revision to the state implementation plan (SIP) for the 1997 8-hour ozone maintenance plan for the Illinois portion of the Chicago-Gary-Lake County, Illinois-Indiana area (the Greater Chicago Area). This SIP revision establishes new Motor Vehicle Emissions Budgets (MVEB) for volatile organic compounds (VOC) and oxides of nitrogen (NO<INF>X</INF>) for the year 2025. EPA is approving the allocation of a portion of the safety margin for VOC and NO<INF>X</INF> in the ozone maintenance plan to the 2025 MVEBs. Total year 2025 emissions of VOC and NO<INF>X</INF> for the area will remain below the attainment levels as required by the transportation conformity regulations.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2014/10/06/2014-23795/approval-and-promulgation-of-air-quality-implementation-plans-illinois-revision-to-the-chicago)
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