Natural Resources Befense Council, Inc. v. United States Environmental Protection Agency

BRIGHT, Circuit Judge.

Petitioners, under 42 U.S.C. § 1857h— 5(b)(1),1 seek review of the decision of the Administrator of the Environmental Protection Agency (EPA) approving portions of Iowa’s Air Pollution Control Implementation Plan (Iowa Plan) adopted pursuant to § 110 of the Clean Air Act Amendments of 1970, 42 U.S.C. § 1857c — 5.

The 1970 Amendments require the Administrator to establish primary and secondary ambient air quality standards which specify maximum amounts of pollutants to be allowed in the ambient air. Primary standards establish allowable máximums consistent with protection…