Some environmental justice advocates say California's cap-and-trade program hasn't done anything to clean up the air in low-income communities like Wilmington, where refineries are located near residential neighborhoods. Maya Sugarman/KPCC hide caption

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Maya Sugarman/KPCC

William Ruckelshaus is sworn in as administrator of the new Environmental Protection Agency as President Richard Nixon looks on at the White House on Dec. 4, 1970. Charles Tasnadi/AP hide caption

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Charles Tasnadi/AP

How The EPA Became A Victim Of Its Own Success

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Face masks were placed on stone monkeys at the Beijing Zoo on Dec. 19 to protest heavy air pollution in northeast China. A week earlier, riot police cracked down after artists put similar masks on human figures in Chengdu. STR/AFP/Getty Images hide caption

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People wearing protective masks walk near the iconic headquarters of Chinese state broadcaster Central China Television in Beijing, which has been blanketed by heavy smog. Andy Wong/AP hide caption

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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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Bloomberg via Getty Images

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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David Gilkey/NPR

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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Rich Preston/NPR

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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Carnegie Mellon University CREATE Lab

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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