CHEYENNE, Wyo. (AP) — The U.S. Environmental Protection Agency can’t force several Wyoming power plants to install new pollution-control equipment while the state’s legal challenge to federal regulations plays out in court, an appeals court panel ruled Tuesday.

Wyoming has proposed less stringent pollution controls on coal-fired power plants than those the EPA says are required to reduce regional haze in national parks and wilderness areas. Wyoming has appealed the federal agency’s rejection of aspects of its plan.