A coalition of states, power companies, and mining groups filed a brief in the U.S. Court of Appeals for the District of Columbia Circuit October 23 charging that the Environmental Protection Agency failed to prove that toxic emissions from power plants endanger public health and should be regulated. The group asked the court to vacate the agency’s mercury and air toxics standards for power plants, claiming that the agency’s December 2000 finding that mercury from power plants should be regulated is “fundamentally flawed.” The agency issued the standards this February.