The village of Hoosick Falls, N.Y., sits along the Hoosick River in eastern New York. Elevated levels of a suspected carcinogen known as PFOA were found in the village's well water, which is now filtered. Hansi Lo Wang/NPR hide caption

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Elevated Levels Of Suspected Carcinogen Found In States' Drinking Water
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An oil field truck is used to make a transfer at oil-storage tanks in Williston, N.D., in 2014. It was atop tanks like these that oil worker Dustin Bergsing, 21, was found dead. Eric Gay/AP hide caption

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Mysterious Death Reveals Risk In Federal Oil Field Rules
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A worker in Claysville, Pa., shovels the fine powder that's part of a watery mixture used in hydraulic fracturing. Silica dust is created in a wide variety of construction and manufacturing industries, too. Keith Srakocic/AP hide caption

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Tighter, Controversial Silica Rules Aimed At Saving Workers' Lungs
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December brought storm clouds to the Porter Ranch neighborhood in Southern California's San Fernando Valley. David McNew/AFP/Getty Images hide caption

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Families Near The Huge Gas Leak Wonder: Is Home A Safe Place To Be?
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A production facility that created lead paint and other lead products once stood at Almond and Cumberland Streets, across Aramingo Avenue in Philadelphia. Kimberly Paynter/WHYY hide caption

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Calls Continue For EPA To Clean Up Former Lead Production Site In Philly
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Eastman Chemical went a step beyond calling Tritan plastic BPA-free, setting off a legal challenge. Eastman hide caption

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Beyond BPA: Court Battle Reveals A Shift In Debate Over Plastic Safety
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Maria Texeira-Gomes holds a photo of her 5-year-old son, Matheo, who has struggled with asthma nearly all his life. Richard Knox/NPR hide caption

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To Control Asthma, Start With The Home Instead Of The Child
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Surplus and expired drugs collected during the DEA's fourth National Prescription Drug Take-Back Day. New research suggests it might be better for the environment to dispose of drugs in household trash. Keith Srakocic/AP hide caption

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Even in the remote Faroe Islands, some children have high levels of perfluorinated compounds in their blood. The chemicals may interfere with the immune system. Stig Nygaard/Flickr hide caption

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Common Chemicals Could Make Kids' Vaccines Less Effective
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