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Visitors stand in front of the view over the Forbidden City, once the home of China's emperors, on a polluted day in Beijing on December 19, 2015. The Chinese capital issued its second-ever red alert for pollution and put its emergency response plan into action, ordering factories to close and pulling half of all private cars off the streets. AFP PHOTO / GREG BAKER / AFP / GREG BAKER (Photo credit should read GREG BAKER/AFP/Getty Images)

Visitors stand in front of the view over the Forbidden City, once the home of China's emperors, on a polluted day in Beijing on December 19, 2015. The Chinese capital issued its second-ever red alert for pollution and put its emergency response plan into action, ordering factories to close and pulling half of all private cars off the streets. AFP PHOTO / GREG BAKER / AFP / GREG BAKER (Photo credit should read GREG BAKER/AFP/Getty Images)
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AFP GREG BAKER