Last month, the Ninth Circuit Court of Appeals denied a petition for review brought by environmental non-governmental organizations (ENGOs) challenging EPA’s conclusion that the Phoenix-Mesa, Arizona metropolitan area, which had been designated nonattainment for a National Ambient Air Quality Standard (NAAQS) for ozone, had met that standard by the applicable deadline.  Bahr v. Regan, No. 20-70092, 2021 U.S. App. LEXIS 22333 (9th Cir. July 28, 2021).  Failure to have met the standard would have had implications in terms of additional air emission controls required in the area.
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