each country has only one city selected

来源: 野生动物摄影家 于 2013-01-29 11:43:34 [] [博客] [旧帖] [给我悄悄话] 阅读数 : (64 bytes)
回答: This is based 2009 data. China will prevail soon 由 quantnj 于 2013-01-29 11:37:20

otherwise US and European cities would not make the list.

所有跟帖： 

• 回复：有可能。这份名单不太可信。巴黎比北京污染得厉害? -QinJin- ♂ 给 QinJin 发送悄悄话 (0 bytes) () 01/29/2013 postreply 11:48:58

• They take only city by country. Beijing is not in their sample s -quantnj- ♀ 给 quantnj 发送悄悄话 (0 bytes) () 01/29/2013 postreply 11:55:29

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