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 - Norilsk
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Oleg Nikishin/Getty Images

Norilsk, Russia -- Founded as a Siberian slave labor camp and home to the world's largest heavy metal smelting complex, an estimated 4 million tons of cadmium, copper, lead, nickel, arsenic, selenium and zinc are released into the air each year, according to Time. Mortality from respiratory diseases is much higher than Russia as a whole.


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