Environmental groups said the rules were not as stringent as they had hoped but would help Americans breathe cleaner air. "These standards are a mixed bag," said John Walke, director of the Natural Resources Defense Council's Clean Air Program.
Industry groups said the regulations were still overly burdensome. Jay Timmons, president and CEO of the National Association of Manufacturers, said the rules were "far from being realistic" and accused the EPA of pushing "another costly and crippling regulation at a time when our economy is on the brink."
Industrial boilers burn coal and other fuels to generate steam and hot water for heat and electricity. After coal-fired power plants, boilers are the nation's second-largest source of mercury emissions, a potent neurotoxin. But boilers are among a handful of pollution sources that still have no standards for toxic emissions.