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Commuters wear masks 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)
Commuters wear masks 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)

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    Beijing residents face costly pollution fight

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Beijing residents face costly pollution fight

CNN's Matt Rivers reports on how Beijing residents are dealing with the latest influx of toxic smog.

Beijing residents face costly pollution fight

CNN's Matt Rivers reports on how Beijing residents are dealing with the latest influx of toxic smog.