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On December 13, 2016, the Environmental Protection Agency (EPA) promulgated initial air quality designations for four areas in Texas for the 2010 sulfur dioxide (SO2) primary National Ambient Air Quality Standard (NAAQS). The action was a supplement to the second of four expected sets of actions to designate areas of the U.S. for the 2010 SO2 NAAQS. In the December 13, 2016, action, three areas were designated nonattainment and one area was designated unclassifiable. The three nonattainment areas are in Freestone and Anderson Counties, Rusk and Panola Counties, and Titus County in Texas. The nonattainment designation was based on EPA's analysis of air quality modeling submitted by Vistra Energy (owner of three power plants in the nonattainment areas) and Sierra Club. The Texas Commission on Environmental Quality (TCEQ) maintains that air quality monitoring is the best way to assess air quality around these plants and did not submit a modeling analysis. TCEQ and Vistra Energy have both filed petitions for judicial review of the Round 2 designations and both have administratively petitioned EPA to change the nonattainment designations. In September 2017, EPA responded to Vistra's petition (preceded the TCEQ petition by several months) for reconsideration by indicating an intent to undertake an administrative action with notice and comment to revisit the nonattainment designations, and the 5th Circuit granted EPA's motion to place the judicial petitions in abeyance on this basis. The three areas in Texas remain nonattainment pending the outcome of EPA's intended administrative action. This action will initiate a notice and comment rulemaking to revisit the initial area designations for Freestone and Anderson Counties, Rusk and Panola Counties, and Titus County in Texas.