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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STR/AFP/Getty Images

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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Andy Wong/AP

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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Money Sharma/AFP/Getty Images

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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David Gilkey/NPR

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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Johnny Haglund

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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Andy Wong/AP

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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Jim Cole/AP

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

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