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
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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.

Catch up on the entire Poisoned Places series, use an interactive map to find toxic polluters in your area or read more about the reporting process behind the investigation.

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