Take a look at some of the world's most polluted cities, as ranked and compiled by Time, the Blacksmith Institute and ABC Environment.
Tianying, China -- This city in China's Anhui province is one of the centers of the nation's lead mining and processing industry. Small-scale operations are notorious for disobeying regulations, causing lead concentrations in the air and soil to be 8.5 to 10 times higher than the national health standard. Many residents are reported to suffer fro lead poisoning.
Boy Scouts of America
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Library of Congress
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