World's most polluted cities

Published On: Jan 14 2013 09:23:54 AM PST   Updated On: Dec 06 2013 07:31:40 AM 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 - Vapi
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Vapi, India -- Sitting at the southern end of a belt of industrial estates, Vapi is suffering the side effect of rapid industrial growth. Mercury levels in the city's groundwater are 96 times higher than WHO safety levels, and heavy metals fill the air and can be found in local produce, according to Time.

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