People, some wearing masks for protection against air pollution, walk on a pedestrian overhead bridge in Beijing as the capital of China is shrouded by heavy smog Monday, Dec. 19, 2016. Engulfed in choking smog, some northern Chinese cities limited the number of cars on roads and temporarily shut down factories on Monday to cut down pollution during a national "red alert." More than 700 companies stopped production in Beijing and traffic police were restricting drivers by monitoring their license plate numbers, state media reported. (AP Photo/Andy Wong)
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