Approval and Promulgation of Air Quality Implementation Plans; Pennsylvania; 15 Percent Plan and 1990 VOC Emission Inventory for the Philadelphia Area

EPA is granting conditional interim approval of the State Implementation Plan (SIP) revision submitted by the Commonwealth of Pennsylvania, for the Philadelphia ozone nonattainment area, to meet the 15 percent reasonable further progress (RFP, or 15% plan), also known as rate-of-progress requirements of the Clean Air Act. EPA is granting conditional interim approval because the 15% plan submitted by Pennsylvania for the Philadelphia area relies on the inspection and maintenance (I/M) program that received a conditional interim approval. Finally, EPA is approving the Philadelphia 1990 VOC emission inventory with certain exceptions as explained herein.