http://www.worstpolluted.org/2009-report.html
http://opentravel.com/blogs/worlds-most-polluted-cities/
http://www.citymayors.com/environment/world_pollution.html
...
http://opentravel.com/blogs/worlds-most-polluted-cities/
http://www.citymayors.com/environment/world_pollution.html
...
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