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 - La Oroya
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La Oroya, Peru -- In this lead mining town in the Peruvian Andes, 99 percent of children have high levels of lead in their blood largely due to an American-owned smelter that's been polluting the city since 1922, according to Time. The expended lead is expected to remain in the soil for centuries, with no plans to clean it up.

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