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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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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Eastman Chemical went a step beyond calling Tritan plastic BPA-free, setting off a legal challenge. Eastman hide caption

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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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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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