Approval and Promulgation of Air Quality Implementation Plans; Pennsylvania; Redesignation of the York (York and Adams Counties) 8-Hour Ozone Nonattainment Area to Attainment and Approval of the Area's Maintenance Plan and 2002 Base Year Inventory

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EPA is proposing to approve a redesignation request and State Implementation Plan (SIP) revisions submitted by the Commonwealth of Pennsylvania. The Pennsylvania Department of Environmental Protection (PADEP) is requesting that the York (York and Adams Counties) ozone nonattainment area (York Area) be redesignated as attainment for the 8- hour ozone national ambient air quality standard (NAAQS). EPA is proposing to approve the ozone redesignation request for the York Area. In conjunction with its redesignation request, the Commonwealth submitted a SIP revision consisting of a maintenance plan for the York Area that provides for continued attainment of the 8-hour ozone NAAQS for at least 10 years after redesignation. EPA is proposing to make a determination that the York Area has attained the 8-hour ozone NAAQS, based upon three years of complete, quality-assured ambient air quality monitoring data for 2004-2006. EPA's proposed approval of the 8-hour ozone redesignation request is based on its determination that the York Area has met the criteria for redesignation to attainment specified in the Clean Air Act (CAA). In addition, the Commonwealth has also submitted a 2002 base year in