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 - Indonesia
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Michael Eko/Getty Images

Central Kalimantan province, Indonesia -- According to ABC Environment, the largest concentration of people at risk from mercury pollution is in Indonesia. In Borneo's Central Kalimantan province, mercury is used to extract gold from ore, a process that is estimated to release 99,000 pounds of mercury into the environment each year.

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