Mealey's (April 25, 2022, 1:20 PM EDT) -- SAN FRANCISCO — In an April 21 unpublished ruling, the Ninth Circuit U.S. Court of Appeals turned away a challenge to the U.S. Environmental Protection Agency’s approval of revisions to Arizona’s state implementation plan (SIP) for satisfying the Clean Air Act requirements for the 2008 ozone National Ambient Air Quality Standards (NAAQS)....