Section 52.2623 - Control strategy and regulations: Ozone(a)Determination of attainment. The EPA has determined, as of June 3, 2016, that based on 2012 to 2014 ambient air quality data, the Upper Green River Basin Area, WY 2008 ozone Marginal nonattainment area has attained the 2008 ozone NAAQS. Therefore, the EPA has met the requirement pursuant to CAA section 181(b)(2)(A) to determine, based on the area's air quality data as of the attainment date, whether the area attained the standard. The EPA also determined that the Upper Green River Basin Area, WY nonattainment area will not be reclassified for failure to attain by its applicable attainment date under section 181(b)(2)(A). 81 FR 26711 , May 4, 2016