World's most polluted cities

POSTED: 09:23 AM PST Jan 14, 2013    UPDATED: 09:55 PM PST Dec 07, 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 - Sukinda
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Sukinda, India -- India's Sukinda Valley contains 97 percent of the country's chromite ore deposits -- used mainly to make chrome plating and stainless steel. Mining leave toxic chromium hexavalent in the air, soil, and surface and drinking water.


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