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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A jogger goes for a run amid heavy smog in Shanghai on Wednesday. China has for the first time agreed to limit its carbon emissions, but critics are questioning whether the move goes far enough. AFP/Getty Images hide caption

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China Agrees To Pollution Limits, But Will It Make A Difference?
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Many people like these Tibetans in Qinghai, China, rely on indoor stoves for heating and cooking. That causes serious health problems. Courtesy of One Earth Designs hide caption

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Police were checking cars throughout Paris on Monday, including near the Arc de Triomphe, as the city tried to cut air pollution by instituting odd-even driving restrictions. Philippe Wojazer /Reuters /Landov hide caption

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Headlamps make cold nights cozier, but leave the fuel-burning lanterns and stoves outside. Gopal Vijayaraghavan/Flickr hide caption

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Skyscrapers are obscured by heavy haze in Beijing on Jan. 13. Air pollution remains a serious — sometimes overwhelming — problem, but researchers say environmental technology is available to solve it. Ng Han Guan/AP hide caption

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China's Air Pollution: Is The Government Willing To Act?
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Men walk along a railway line in Beijing on Jan. 12, as air pollution reached hazardous levels. Wang Zhao/AFP/Getty Images hide caption

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China's Air Pollution Linked To Millions Of Early Deaths
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