The U.S. Supreme Court on Tuesday agreed to weigh a challenge by industry groups and some states to an Obama administration regulation intended to limit emissions of mercury and other hazardous pollutants mainly from coal-fired power plants.
In a blow to the administration, the justices said in a brief order they would review an April ruling by the U.S. Court of Appeals for the District of Columbia Circuit that upheld the rule.
The court will decide whether the U.S. Environmental Protection Agency should have considered the cost of compliance when deciding whether to regulate the pollutants.