Section 52.153 - Control strategy and regulations: Ozone(a)Determination of attainment by the attainment date. Effective December 12, 2019 the EPA has determined that the Phoenix-Mesa Moderate nonattainment area in Arizona attained the 2008 8-hour ozone National Ambient Air Quality Standards (NAAQS) by the applicable attainment date of July 20, 2018, based upon complete, quality-assured, and certified data for the calendar years 2015-2017. The EPA has also determined that the requirement of section 172(c)(9) to provide for contingency measures to be implemented in the event the area fails to attain by its attainment date for the 2008 8-hour NAAQS does not apply to the area.(b)Determination of attainment by the attainment date. Effective November 7, 2022 the EPA has determined that the Yuma County Marginal nonattainment area in Arizona attained the 2015 8-hour ozone National Ambient Air Quality Standards (NAAQS) by the applicable attainment date of August 3, 2021, based upon complete quality-assured and certified data for the calendar years 2018-2020. 84 FR 60927 , Nov. 12, 2019, as amended at 87 FR 60913 , Oct. 7, 2022 84 FR 60927 , 12/12/2019; 87 FR 60898 , 11/7/2022