Whether the EPA's disapproval of a State Implementation Plan may only be challenged in the D.C. Circuit

QUESTION PRESENTED Whether the Environmental Protection Agency’s disapproval of a State Implementation Plan may only be challenged in the D.C. Circuit under 42 U.S.C. § 7607(b)(1) if EPA packages that disapproval with disapprovals of other States’ SIPs and purports to use a consistent method in evaluating the state-specific determinations in those SIPs.