World's most polluted cities

Published On: Jan 14 2013 09:23:54 AM PST   Updated On: Dec 07 2013 09:55:33 PM PST

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 - Zambia
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Blacksmith Institute

Kabwe, Zambia -- Rich deposits of lead were found here in 1902, and while most mines and smelters are no longer operating, lead concentrations in children are five to 10 times the permissible U.S. Environmental Protection Agency levels, and can even be high enough to kill, according to Time.

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