WASHINGTON, Dec 10 (Reuters) – The U.S. environmental
regulator argued in court on Tuesday that its rule limiting
mercury and hazardous air pollutants is “appropriate and
necessary,” not an improper interpretation of the federal Clean
Air Act as industry groups and some states contend.
The U.S. Court of Appeals for the District of Columbia
Circuit, the second most powerful court in the country behind
the Supreme Court, heard two cases challenging the Environmental
Protection Agency’s first rules to crack down on mercury from
the country’s fleet of electric generating units.