November 25, 2011
May 19, 2014 at 12:19 pm ET
Poisoned Places: By the numbers
Some residents of Hayden, Ariz., believe that emissions of toxic metals from the Asarco copper smelter have caused cancer and other maladies. The EPA has accused Asarco of underreporting such emissions.Emma Schwartz/iWatch News
From Tonawanda, N.Y. to Hayden, Ariz., hundreds of U.S. communities are still exposed to pollutants, which can cause cancer, birth defects and other health issues — more than 20 years after passage of the Clean Air Act.