Lanzhou in northwestern China is even worse, and so is Bakersfield, California, according to the World Health Organization data published in 'The Economist.'
After a few days of insanely polluted air, China blew the top off the charts of how polluted air could be. The Economist has released this chart which notes that Beijing is not even one of the most polluted places in China:
Using a different but more widely used measure collated by the World Health Organisation of larger particulate matter called PM 10 (particles of 10 microns or less), which allows cross-country comparisons, that dubious honour is bestowed on Lanzhou in the northwestern province of Gansu (and the city of Ludhiana in India is more polluted still).
http://www.fastcoexist.com/1681217/beijing-isnt-the-most-polluted-city
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