A comprehensive study of air pollution in the U.S. finds it still kills thousands a year, and disproportionately affects poor people and minorities. Robert Nickelsberg/Getty Images hide caption

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Robert Nickelsberg/Getty Images

U.S. Air Pollution Still Kills Thousands Every Year, Study Concludes

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Unsold cars, used and new, are unloaded from tractor-trailers into a parking lot south of Madrid. It's one of the biggest sales areas for used cars and scrap metal near the Spanish capital. Vendors say they're anticipating difficulty selling diesel cars, now that Madrid and other European capitals have announced plans to ban them. Lauren Frayer for NPR hide caption

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Lauren Frayer for NPR

In Madrid, A Plan To Fight Pollution By Shifting Away From Diesel-Run Cars

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Pollution has driven some families to leave Beijing. A group of Chinese lawyers is suing the governments of Beijing and its surrounding areas for not doing enough to get rid of the smog. Andy Wong/AP hide caption

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Andy Wong/AP

For Some In China's Middle Class, Pollution Is Spurring Action

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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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Mai Dang, who owns Fashion Nails in Berkeley, Calif., does a client's nails. The ventilator hose poised over her shoulder helps keeps noxious fumes at bay. Jenny Gold/Kaiser Health News hide caption

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Jenny Gold/Kaiser Health News

California Nail Salons Start To Invest In Worker Safety

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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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An Indian worker sweeps a street in a cloud of choking smog in New Delhi on Monday, the day after fireworks for the Diwali festival. After millions of firecrackers were lit, New Delhi's air pollutants shot up far higher than normal levels. Money Sharma/AFP/Getty Images hide caption

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Police patrol traffic in Paris as part of new anti-pollution measures aimed at punishing vehicles registered before 1997 that are forbidden to be driven during the week. Nearly 30 police officers stood guard on the morning of July 1, in the main squares of Paris to control and raise awareness among the drivers about the new measures. FRANCOIS GUILLOT/AFP/Getty Images hide caption

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FRANCOIS GUILLOT/AFP/Getty Images

To Fight Pollution, Paris Imposes Weekday Ban On Old Cars

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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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A special hearth (left) for "green" cremations uses less wood and takes less time than traditional cremations. The new cremation method cuts down on air pollution. David Gilkey/NPR hide caption

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In India, Eco-Friendly Cremation Is Easy — But It's A Tough Sell

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