Court of Appeals for the Second Circuit February 27, 2003, Docket Nos. 02-4033, 02-4073, 02-4075 and 02-4077 (New York Public Interest Research Group v. Whitman)

B.D. PARKER, JR., Circuit Judge.

These challenges by the New York Public Interest Research Group (“NYPIRG”) to final decisions by the United States Environmental Protection Agency (“EPA”) call upon us to clarify certain aspects of federal oversight authority in the cooperative state/federal regulatory scheme established by the Clean Air Act (“CAA”), 42 U.S.C. §§ 7401-7671q.