(a) Determination of attainment. EPA has determined, as of September 13, 2017, that the Jefferson County 2010 SO2 nonattainment has attained the 2010 SO2 1-hr NAAQS. This determination suspends the requirements for this area to submit an attainment demonstration, associated reasonably available control measures, reasonable further progress, contingency measures, and other plan elements related to attainment of the standards for as long as the area continues to meet the 2010 SO2 1-hr NAAQS.

(b) Determination of attainment. EPA has determined, as of July 9, 2020, that the Jackson County 2010 SO2 nonattainment has attained the 2010 SO2 1-hr NAAQS. This determination suspends the requirements for this area to submit an attainment demonstration, associated reasonably available control measures, reasonable further progress, contingency measures, and other plan elements related to attainment of the standards for as long as the area continues to meet the 2010 SO2 1-hr NAAQS.

(c) Redesignation to attainment. As of February 28, 2022, the Jefferson County 2010 SO2 nonattainment area is redesignated to attainment of the 2010 SO2 1-hour National Ambient Air Quality Standard (NAAQS) in accordance with the requirements of Clean Air Act (CAA) section 107(d)(3) and EPA has approved its maintenance plan and supplemental modeling demonstration analyses as meeting the requirements of CAA section 175A.

(d) Redesignation to attainment. As of March 2, 2022, the Jackson County 2010 SO2 nonattainment area is redesignated to attainment of the 2010 SO2 1-hour National Ambient Air Quality Standard (NAAQS) in accordance with the requirements of Clean Air Act (CAA) section 107(d)(3) and EPA has approved its maintenance plan and maintenance plan supplement as meeting the requirements of CAA section 175A.