each country has only one city selected

來源: 野生動物攝影家 於 2013-01-29 11:43:34 [] [博客] [舊帖] [給我悄悄話] 閱讀數 : (64 bytes)
回答: This is based 2009 data. China will prevail soon 由 quantnj 於 2013-01-29 11:37:20

otherwise US and European cities would not make the list.

所有跟帖： 

• 回複：有可能。這份名單不太可信。巴黎比北京汙染得厲害? -QinJin- ♂ 給 QinJin 發送悄悄話 (0 bytes) () 01/29/2013 postreply 11:48:58

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

請您先登陸，再發跟帖！