Air pollution clouds Shanghai

Thick smog in Shanghai has forced flight cancellations and school closures.

A city lost in smog

shanghai air 3
A man flies a kite in front of Shanghai's famous skyline.

Home to more than 20 million people, the city of Shanghai has been blanketed by a thick layer of smog for days.

Reduced visibility has resulted in hundreds of canceled flights, and health worries have prompted schools to close. A change in weather patterns is causing conditions to improve, but air in the city is still classified as unhealthy for sensitive groups.

- Last updated December 10 2013 03:59 AM ET

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