Buildings are seen shrouded in smog from the 102nd floor of Seoul's Lotte World Tower in December 2015. Bloomberg via Getty Images hide caption

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Korea's Air Is Dirty, But It's Not All Close-Neighbor China's Fault

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Dr. Gita Prakash (left), who runs a family clinic from her home in New Delhi, examines 10-year-old Sonu Kumar Chaudhary as his father, restaurant deliveryman Dilip Kumar Chaudhary, looks on. Prakash sees more and more cases of illness caused by the city's polluted air. David Gilkey/NPR hide caption

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India's Big Battle: Development Vs. Pollution

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After the pigeons are fitted with pollution sensors, they are released into different parts of London. Londoners can then get live air quality readings via Twitter. Rich Preston/NPR hide caption

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Pigeons Are London's Newest Pollution Fighters

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One Of The Nation's Biggest Urban Forests Isn't Where You'd Expect

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The Speck air quality monitor costs $200, but is available to all through Pittsburgh's public library system. Carnegie Mellon University CREATE Lab hide caption

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A Home Air Quality Monitor That Can Be Checked Out From The Library

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Burden Of Proof Hurt State In N.J.-Exxon Settlement, Some Say

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Bayway Refinery in Linden, N.J., is one of two refineries that are involved in the settlement. It's no longer owned by Exxon, but they are on the hook for the cleanup. Joel Rose/NPR hide caption

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Exxon Settlement Falls Short Of Damage, N.J. Democrats Say

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The abandoned Cherokee Clay and Brick Mine in Lee County, N.C., may become a landfill for coal ash. Dave DeWitt/WUNC hide caption

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After Toxic Ash Spill, Energy Company And Locals Struggle Over Solution

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Journalist Chai Jing used $160,000 of her own money to produce a documentary on China's air pollution problem. Screenshot/Under the Dome hide caption

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The Anti-Pollution Documentary That's Taken China By Storm

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A fisherman collects water on a beach littered with trash at an ecological reserve south of Manila in 2013. Francis R. Malasig/EPA/Landov hide caption

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8 Million Tons Of Plastic Clutter Our Seas

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