May 19, 2016 – Federal Register Recent Federal Regulation Documents

EPA is proposing to partially approve and partially disapprove the Arizona State Implementation Plan (SIP) as meeting the requirements of Sections 110(a)(1) and 110(a)(2) of the Clean Air Act (CAA or the Act) for the implementation, maintenance, and enforcement of the 2010 nitrogen dioxide (NO2) and 2010 sulfur dioxide (SO2) national ambient air quality standards (NAAQS). CAA section 110(a)(1) requires that each state adopt and submit a SIP for the implementation, maintenance, and enforcement of each NAAQS promulgated by EPA, and that EPA act on such SIPs. We refer to such SIPs as ``infrastructure'' SIPs because they are intended to address basic structural SIP requirements for new or revised NAAQS including, but not limited to, legal authority, regulatory structure, resources, permit programs, monitoring, and modeling necessary to assure attainment and maintenance of the standards. In addition to our proposed partial approval and partial disapproval of Arizona's infrastructure SIP, we are proposing to reclassify one region of the state for SO2 emergency episode planning. EPA is also proposing to approve Arizona Revised Statutes related to conducting air quality modeling and providing modeling data to EPA into the Arizona SIP. We are taking comments on this proposal and plan to follow with a final action.