World's most polluted cities

Published On: Jan 14 2013 11:23:54 AM CST   Updated On: Dec 07 2013 11:55:33 PM CST

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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