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Smog hangs over a road on a polluted day in Beijing on December 20, 2016. Heavy smog suffocated northeast China for a fifth day on December 20, with hundreds of flights cancelled and road and rail transport grinding to a halt under the low visibility conditions. / AFP / Greg Baker (Photo credit should read GREG BAKER/AFP/Getty Images)

Smog hangs over a road on a polluted day in Beijing on December 20, 2016. Heavy smog suffocated northeast China for a fifth day on December 20, with hundreds of flights cancelled and road and rail transport grinding to a halt under the low visibility conditions. / AFP / Greg Baker (Photo credit should read GREG BAKER/AFP/Getty Images)
Getty Images

AFP GREG BAKER