The Trump administration on Wednesday took a step toward rolling back a rule that limits smokestack emissions that burden downwind areas in neighboring states.

The so-called “good neighbor” rule is one of dozens of regulations that Environmental Protection Agency Administrator Lee Zeldin has targeted for reconsideration or repeal. The Supreme Court ruled in 2024 that the EPA could not enforce the rule, which is intended to block coal-fired power plants and other industrial sites from adding significantly to air pollution across state lines.

The EPA said Wednesday it is proposing to approve plans by eight states to regulate ozone air pollution as they see fit. If finalized, the states “would no longer need to worry about another ‘Good Neighbor Plan’” subject to approval by the federal government, the agency said.