WIGGINS, Circuit Judge:
Residents of Maricopa and Pima counties, Arizona, petition this court to vacate as arbitrary and capricious the Environmental Protection Agency's approvals of the counties' Clean Air Act implementation plans. We have jurisdiction under 42 U.S.C. § 7607(b)(1) (1982). We vacate the EPA's approvals of the plans, and direct the EPA to take further action consistent with this opinion.
BACKGROUND
The Clean Air Act, as amended...
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