Delaware Citizens for Clean Air, Inc., a Delaware Corporation v. Administrator U. S. Environmental Protection Agency and William D. Ruckelshaus

OPINION OF THE COURT

VAN DUSEN, Circuit Judge.

Pursuant to § 307(b)(1) of the Clean Air Act, 42 U.S.C. § 1857h-5(b) (1) (1970), 1 Delaware Citizens for Clean Air, Inc. (DCCA) here challenges the Environmental Protection Agency’s (EPA) approval of portions of Delaware’s implementation plan. The challenge is on the merits. We stress this point because all the decided cases we have been able to locate either deal with strictly procedural attacks or dispose of substantive attacks on procedural grounds. See Duquesne Light Co. v. EPA, 481 F.2d 1, Nos. 72-1542 and 72-1543 (3d Cir., 1973); Utah…