World's most polluted cities

POSTED: 09:23 AM PST Jan 14, 2013    UPDATED: 07:31 AM PST Dec 06, 2013 

Severe pollution is once again choking Shanghai and other cities in China, disrupting hundreds of flights and forcing schools to close. China is home to some of the world's most polluted cities -- take a look at some of the others.

Most Polluted - Linfen
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Linfen, China -- One of China's most polluted cities, Linfen sits in the heart of the country's coal belt. The hills are dotted with mines, both legal and illegal, and the air is filled with burning coal. Hanging laundry is known to turn black before it dries.


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