A federal appeals court on Tuesday upheld the Environmental Protection Agency's first emission standards for mercury and other hazardous air pollutants from coal- and oil-fired power plants. In its ruling, the court rejected state and industry challenges to rules designed to clean up chromium, arsenic, acid gases, nickel, cadmium as well as mercury and other dangerous toxins. The EPA’s determination in 2000 that regulating emission standards is appropriate and necessary, and the agency’s reaffirmation of that determination in 2012, “are amply supported by EPA’s findings regarding the health effects of mercury exposure,” said the court. Congress did not specify what...