# Approval and Promulgation of Air Quality Implementation Plans; Pennsylvania; Redesignation of the Mercer County Portion of the Youngstown-Warren-Sharon, OH-PA 8-Hour Ozone Nonattainment Area to Attainment and Approval of the Area's Maintenance Plan and 2002 Base Year Inventory
> **Rule** · Final rule. · Published 2007-10-19 · Effective 2007-11-19 · 72 FR 59213
## Document
- **Document number:** E7-20567
- **Category:** air-emissions
- **Federal Register citation:** 72 FR 59213
- **CFR reference:** 40 CFR 52
- **Publication date:** 2007-10-19
- **Effective date:** 2007-11-19
- **State:** PA
- **EPA docket:** EPA-R03-OAR-2007-0344
## Abstract

EPA is approving a State Implementation Plan (SIP) revision submitted by the Commonwealth of Pennsylvania. The Pennsylvania Department of Environmental Protection (PADEP) is requesting that the Mercer County portion of the Youngstown-Warren-Sharon, OH-PA 8-hour ozone nonattainment area ("Youngstown Area" or "Area") be redesignated as attainment for the 8-hour ozone ambient air quality standard (NAAQS). The Area is comprised of Mercer County, Pennsylvania and Trumbull, Mahoning, and Columbiana Counties, Ohio. EPA is approving the ozone redesignation request for Mercer County. In a separate rulemaking action (72 FR 32190, June 12, 2007) EPA approved the ozone redesignation request for Trumbull, Mahoning, and Columbiana Counties, Ohio. In conjunction with its redesignation request, PADEP submitted a SIP revision consisting of a maintenance plan for Mercer County that provides for continued attainment of the 8-hour ozone NAAQS for at least 10 years after redesignation. EPA is approving the 8-hour maintenance plan. PADEP also submitted a 2002 base year inventory for Mercer County which EPA is approving. In addition, EPA is approving the adequacy determination for the motor vehicle emission budgets (MVEBs) that are identified in the Mercer County maintenance plan for purposes of transportation conformity, and is approving those MVEBs. EPA is approving the redesignation request, and the maintenance plan and the 2002 base year emissions inventory as revisions to the Pennsylvania SIP in accordance with the requirements of the Clean Air Act (CAA).

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2007/10/19/E7-20567/approval-and-promulgation-of-air-quality-implementation-plans-pennsylvania-redesignation-of-the)
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