SPRECHER, Circuit Judge.
This case arises from the Environmental Protection Agency's promulgation of a list designating those areas which do not meet national primary or secondary ambient air quality standards. The petitioners attack these designations on both substantive and procedural grounds. We find both claims to be without merit, and we uphold the agency's designations.
I
Under the Clean Air Act, 42 U.S.C. §§ 7401-7626, the Administrator...
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