This is based 2009 data. China will prevail soon
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By this website, Lanzhou is not too bad.
-quantnj-
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01/29/2013 postreply
11:54:25
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each country has only one city selected
-野生動物攝影家-
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01/29/2013 postreply
11:43:34
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回複:有可能。這份名單不太可信。巴黎比北京汙染得厲害?
-QinJin-
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01/29/2013 postreply
11:48:58
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They take only city by country. Beijing is not in their sample s
-quantnj-
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01/29/2013 postreply
11:55:29