Approval and Promulgation of Air Quality Implementation Plans; Pennsylvania; VOC and NOX RACT Determinations for Merck and Co., Inc.

EPA is approving a State Implementation Plan (SIP) revision submitted by the Commonwealth of Pennsylvania (Pennsylvania or the Commonwealth). This revision establishes and requires reasonably available control technology (RACT) for a major source of volatile organic compound (VOC) and nitrogen oxide (NO<INF>X</INF>) pursuant to the Pennsylvania's SIP-approved generic RACT regulations. The VOC and NO<INF>X</INF> major source is Merck and Co., Inc. (Merck) located in Northumberland County, Pennsylvania. EPA is approving this revision in accordance with the Clean Air Act (CAA).