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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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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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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Coal fires burn early in the morning in January 2014 at a privately owned coal mine in India's Jharkand state, making the air dense with noxious smoke and dust. Forty percent of India's mineral wealth lies in Jharkhand. Johnny Haglund hide caption

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India's Quandary: Climate Change And Coal

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Beijing's chronic high pollution has forced residents to adjust to living with the haze. China is the world's biggest greenhouse gas emitter, but until recently, the government treated air pollution and climate change as separate issues, saying climate change was a Western problem. Andy Wong/AP hide caption

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China's Greenhouse Gases Don't Seem To Trouble Most Of Its Citizens

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A plume of steam billows from the coal-fired Merrimack Station in Bow, N.H. in January 2015. Jim Cole/AP hide caption

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Supreme Court Rules In Industry's Favor. What's EPA's Next Move?

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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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Poland's second-largest city is also a major tourist destination. Krakow (seen here at night from the Krakus Mound) is suffering some of the worst air pollution in Europe. Arek Olek/Flickr hide caption

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Plagued By Smog, Krakow Struggles To Break Its Coal-Burning Habit

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A woman wears a face mask on a hazy January day in downtown Shanghai. China has ordered a popular anti-pollution film removed from major online outlets. In Xi'an, two people who had protested against smog were reportedly detained. ALY SONG/Reuters /Landov hide caption

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A lot of the airborne particles in the Earth's atmosphere come from natural sources, such as desert dust (red-orange) and sea salt (blue). But there's also soot from fires (green and yellow) and sulfur emissions (white) from burning fossil fuel. William Putman/ NASA/Goddard hide caption

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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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Smoke rises from chimneys of coal-based power plants in the Sonbhadra District of Uttar Pradesh, India. The Washington Post/Getty Images hide caption

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Young Indians Learn To Fight Pollution To Save Lives

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