Determination of Attainment by the Attainment Date for the 2008 Ozone National Ambient Air Quality Standards; Phoenix-Mesa, Arizona

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The Environmental Protection Agency (EPA) is taking final action to determine that the Phoenix-Mesa ozone nonattainment area ("Phoenix NAA"), which is classified as "Moderate" for the 2008 ozone National Ambient Air Quality Standards (NAAQS or "standards"), attained the NAAQS by the Moderate area attainment date of July 20, 2018. This determination is based on complete, quality-assured, and certified data for 2015-2017. This final action is necessary to fulfill the EPA's statutory obligation to determine whether ozone nonattainment areas attained the NAAQS by the applicable attainment date.