WILDEARTH GUARDIANS v. E.P.A.

No. 14-1145.

830 F.3d 529 (2016)

WILDEARTH GUARDIANS, et al., Petitioners v. ENVIRONMENTAL PROTECTION AGENCY, Respondent. San Joaquin Valley Unified Air Pollution Control District and South Coast Air Quality Management District, Intervenors.

United States Court of Appeals, District of Columbia Circuit.

Decided July 29, 2016.


Attorney(s) appearing for the Case

Paul Cort argued the cause for petitioners. With him on the briefs was Colin C. O'Brien .

Brian H. Lynk , Attorney, U.S. Department of Justice, argued the cause for respondent. With him on the brief was John C. Cruden , Assistant Attorney General. Sam Hirsch , Attorney, entered an appearance.

Barbara Baird , Indianapolis, IN, Lauren Nevitt , Annette A. Ballatore-Williamson , and Jessica E. Hafer Fierro were on the brief for respondent-intervenors San Joaquin Valley Unified Air Pollution Control District and South Coast Air Quality Management District.

Before: Srinivasan, Circuit Judge, and Williams and Ginsburg, Senior Circuit Judges.


Under the Clean Air Act, the Environmental Protection Agency promulgates national ambient air quality standards. The Act sets out distinct statutory frameworks of varying levels of strictness for EPA to apply to air pollutants. This case involves the agency's regulation under the Act of a...

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