First pushed through by the Republican senator and climate denier Jim Inhofe, the rule has become a "regulatory escape hatch" for states that want to meet federal air-quality standards.
Major investigation shows local governments are increasingly exploiting a loophole in the Clean Air Act, leaving more than 21 million Americans with air that’s dirtier than they realize. California leads the nation it its use.
A major investigation shows local governments are increasingly exploiting a loophole in the Clean Air Act, leaving more than 21 million Americans with air that's dirtier than they realize.