The US Supreme Court issued a 6-3 decision overturning the long-standing Chevron deference doctrine, a move that could undercut aggressive efforts to tighten tailpipe emissions standards. The ruling casts uncertainty over the broader regulatory plan.
By limiting how much courts defer to agency interpretations, the decision reshapes the landscape for environmental rulemaking. The outcome may force regulators to rethink their approach to emissions, with significant implications for the auto industry’s future.