Committee for a Better Arvin v. U.S. Environmental Protection Agency

OPINION

GOULD, Circuit Judge:

Petitioners, a contingent of environmental and community groups, bring serious challenges to the State of California’s plans to improve air quality in the San Joaquin Valley, an area with some of the worst air quality in the United States. We must consider whether these state plans are sufficient'in law, specifically, whether the regulating United States Environmental Protection Agency (“EPA”) erred in approving California’s State Implementation Plans (“SIPs”) to comply with National Ambient Air Quality Standards (“NAAQS”) enacted under the federal Clean Air Act…