# Approval and Promulgation of Air Quality Implementation Plans; Pennsylvania; Redesignation of the Liberty Borough PM10 Nonattainment Area to Attainment and Approval of the Associated Maintenance Plan
> **Rule** · Final rule. · Published 2003-09-11 · Effective 2003-10-14 · 68 FR 53515
## Document
- **Document number:** 03-23265
- **Category:** air-emissions
- **Federal Register citation:** 68 FR 53515
- **CFR reference:** 40 CFR 52
- **Publication date:** 2003-09-11
- **Effective date:** 2003-10-14
- **State:** PA
- **EPA docket:** PA189-4300
## Abstract

EPA is approving a request for Pennsylvania to redesignate the Liberty Borough area of Allegheny County, Pennsylvania (the Liberty Borough area) from nonattainment to attainment for the national ambient air quality standard (NAAQS) for particulate matter with an aerodynamic diameter less than or equal to a nominal 10 microns (PM<INF>10</INF>). EPA is also approving a maintenance plan for the Liberty Borough area. Both the redesignation request and maintenance plan were submitted by the Pennsylvania Department of Environmental Protection (PADEP) on behalf of the Allegheny County Health Department (ACHD). Approval of the maintenance plan, as a revision to the Pennsylvania State Implementation Plan (SIP), puts a plan in place for maintaining the PM<INF>10</INF> standard for the next ten years in the Liberty Borough area. This action is being taken in accordance with the Clean Air Act (CAA).

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2003/09/11/03-23265/approval-and-promulgation-of-air-quality-implementation-plans-pennsylvania-redesignation-of-the)
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