part_subject: "DESIGNATION OF AREAS FOR AIR QUALITY PLANNING PURPOSES"
subpart_code: "B"
subpart_subject: "Designation of Air Quality Control Regions"
section_number: "81.23"
section_subject: "Southwest Pennsylvania Intrastate Air Quality Control Region."
cfr_reference: "40 CFR 81.23"
title_name: "Title 40"
title_subject: "Protection of Environment"
parts_covered: "Part 81"
revised_date: "Revised as of July 1, 2019"
publication_date: "As of July 1, 2019"
contains_description: "Containing a codification of documents of general applicability and future effect"
publication_info: "Published by the Office of the Federal Register National Archives and Records Administration as a Special Edition of the Federal Register"
---
The Southwest Pennsylvania Intrastate Air Quality Control Region is redesignated to consist of the territorial area encompassed by the boundaries of the following jurisdictions or described area (including the territorial area of all municipalities (as defined in section 302(f) of the Clean Air Act, 42 U.S.C. 1857h(f)) geographically located within the outermost boundaries of the area so delimited):
In the State of Pennsylvania: Allegheny County, Armstrong County, Beaver County, Butler County, Greene County, Fayette County, Indiana County, Washington County, Westmoreland County.