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Supreme Court Halts EPA’s Federal Air Quality Plan Citing Issues with Good Neighbor Provisions
In a 5-4 decision, a divided Supreme Court stayed the enforcement of the Environmental Protection Agency’s (“EPA”) Federal Implementation Plan (“FIP”) holding that the emission control measures set to be used in upwind states to improve ozone levels in downwind states was arbitrary and capricious. Ohio et al. v. Env’t Prot. Agency, No. 23A349, No. 23A350, No. 23A351, No. 23A384, 2024 WL 3187768 at *11 (S. Ct. June 27, 2024). The Court reasoned that EPA’s FIP rested on the assumption that all upwind states would adopt emission-reduction measures to ensure effective downwind air quality improvements. EPA, however, failed to reasonably explain if the FIP would be operable if some upwind states fell out of the plan. In the short term, the stay provides temporary relief to industry groups and states that challenged various aspects of the FIP in the D.C. Circuit; in the long term, the Court’s ruling spells trouble for the FIP’s efficacy if and when federal courts rule on the merits of the rule’s legality.
