Take a look at some of the world's most polluted cities, as ranked and compiled by Time, the Blacksmith Institute and ABC Environment.
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.
Library of Congress
Auction Team Breker
Chuck Kennedy/The White House
Boy Scouts of America
JASON REDMOND / Reuters
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