Partial Approval and Partial Disapproval of Air Quality State Implementation Plans; Arizona; Infrastructure Requirements To Address Interstate Transport for the 2008 Ozone NAAQS
The Environmental Protection Agency (EPA) is proposing to partially approve and partially disapprove a State Implementation Plan (SIP) revision submitted by the Arizona Department of Environmental Quality on December 27, 2012, and supplemented on December 3, 2015, to address the interstate transport requirements of Clean Air Act (CAA or Act) section 110(a)(2)(D) with respect to the 2008 ozone (O3) national ambient air quality standard (NAAQS). We are proposing to approve the portion of the Arizona SIP pertaining to significant contribution to nonattainment or interference with maintenance in another state and proposing to disapprove the portion of Arizona's SIP pertaining to interstate transport visibility requirements. EPA's rationale for proposing to partially approve and partially disapprove Arizona's December 27, 2012 SIP revision and December 3, 2015 supplement is described in this notice. EPA previously took two separate actions on Arizona's December 27, 2012 submittal, on July 14, 2015 and August 10, 2015. We are taking comments on this proposal and plan to follow with a final action no later than June 7, 2016.
Air Plan Disapprovals; MS; Prong 4-2008 Ozone, 2010 NO2,
The Environmental Protection Agency (EPA) is proposing to disapprove the visibility transport (prong 4) portions of revisions to the Mississippi State Implementation Plan (SIP), submitted by the Mississippi Department of Environmental Quality (MDEQ), addressing the Clean Air Act (CAA or Act) infrastructure SIP requirements for the 2008 8-hour Ozone, 2010 1-hour Nitrogen Dioxide (NO2), 2010 1- hour Sulfur Dioxide (SO2), and 2012 annual Fine Particulate Matter (PM2.5) National Ambient Air Quality Standards (NAAQS). The CAA requires that each state adopt and submit a SIP for the implementation, maintenance, and enforcement of each NAAQS promulgated by EPA, commonly referred to as an ``infrastructure SIP.'' Specifically, EPA is proposing to disapprove the prong 4 portions of Mississippi's May 29, 2012, 2008 8-hour Ozone infrastructure SIP submission; July 26, 2012, 2008 8-hour Ozone infrastructure SIP resubmission; February 28, 2013, 2010 1-hour NO2 infrastructure SIP submission; June 20, 2013, 2010 1-hour SO2 infrastructure SIP submission; and December 8, 2015, 2012 annual PM2.5 infrastructure SIP submission. All other applicable infrastructure requirements for these SIP submissions have been or will be addressed in separate rulemakings.