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 - Tianying
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Tianying, China -- This city in China's Anhui province is one of the centers of the nation's lead mining and processing industry. Small-scale operations are notorious for disobeying regulations, causing lead concentrations in the air and soil to be 8.5 to 10 times higher than the national health standard. Many residents are reported to suffer fro lead poisoning.

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