中国严重空气污染情况恐将持续 (Grave Pollution in China to Continue)
British Broadcasting Corporation, January 14, 2013
http://www.bbc.co.uk/zhongwen/simp/chinese_news/2013/01/130114_china_air.shtml
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多数人对北京空气质量认知过于乐观 (CASS Report: Majority of People Overly Optimistic about Beijing's Air Quality)
Legal Daily, January 14, 2013
http://www.legaldaily.com.cn/index_article/content/2013-01/14/content_4125590.htm