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China's Smoggy Days Vs. Clear Ones

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Source
Archaeology
Date
3:45 PM | February 07, 2013
Language
English
Categories
Archeology
URL
http://feedproxy.google.com/~r/DiscoveryNews-Archaeology-News/~3/y7U7Jdg-ppM/chinas-smoggy-days-vs-clear-130207.htm
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Residents across huge swathes of northern China have battled through choking pollution at extreme levels.

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