Approval and Promulgation of Air Quality Implementation Plans; Pennsylvania; Redesignation of the Hazelwood SO2 Nonattainment and the Monongahela River Valley Unclassifiable Areas to Attainment and Approval of the Maintenance Plan

EPA is approving State Implementation Plan (SIP) revisions submitted by the Commonwealth of Pennsylvania. These revisions include a regulation change to the allowable sulfur oxide emission limits for fuel burning equipment, and a modeled demonstration of attainment of the national ambient air quality standards (NAAQS) for sulfur dioxide (SO<INF>2</INF>) in the Hazelwood nonattainment area and the Monongahela River Valley unclassifiable area, located in the Allegheny Air Basin in Allegheny County, Pennsylvania. In addition, EPA is redesignating these areas to attainment of the NAAQS for SO<INF>2</INF>, and approving a combined maintenance plan for both areas as a SIP revision. These SIP revisions were submitted by the Pennsylvania Department of Environmental Protection (PADEP) on behalf of the Allegheny County Health Department (ACHD). This action is being taken in accordance with the Clean Air Act (CAA).