Revisions to the Arizona State Implementation Plan, Arizona Department of Environmental Quality and Maricopa County Air Quality Department

EPA is finalizing approval of revisions to the Arizona Department of Environmental Quality (ADEQ) and Maricopa County Air Quality Department (MCAQD) portions of the Arizona State Implementation Plan (SIP). This action was proposed in the Federal Register on June 27, 2012 and concerns regulations that require monitoring and reporting of volatile organic compounds (VOC), oxides of nitrogen (NO<INF>X</INF>), and particulate matter (PM) emissions from stationary sources. We are approving local rules that regulate these emission sources under the Clean Air Act (CAA or the Act). We are not acting on two Pima County Department of Environmental Quality (PCDEQ) rules originally listed in our June 27, 2012 proposed action because official copies of these rules with public process documentation were not submitted for SIP approval.