Take a look at some of the world's most polluted cities, as ranked and compiled by Time, the Blacksmith Institute and ABC Environment.
Chernobyl, Ukraine -- Even nearly 27 years after the nuclear reactor meltdown, a 19-mile area surrounding Chernobyl remains dangerously radioactive and uninhabitable. Between 1992 and 2002, more than 4,000 cases of thyroid cancer cases were diagnosed among Russian, Ukrainian and Belarusian children living in the fallout zone, 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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