2013年，中央电视台前资深记者柴静外出采访期间得知自己怀孕的消息。然而作为母亲的喜悦很快被女儿良性肿瘤的诊断结果所冲淡，虽然小天使的手术顺利完成，但她似乎开始为无时不在的雾霾污染担忧起来。紧闭的门窗无法锁住孩子渴望在蓝天白云下奔跑的悸动之心，无奈隐形的杀手时时刻刻都在 摧残人们的健康乃至生命。“我不是多怕死，我只是不想那么活。”抱持着这样的想法，柴静对雾霾的成因、组成以及引发的严重后果展开调查。我们才知道，原来2004年被人们当作雾的东西就已经是霾了。原来主要组成物质苯并a芘竟超标14倍之多。原来60%的雾霾污染物来自燃煤、燃油及其复合体。原来国家法律法规中竟有着如此多的漏洞。原来金钱利益的驱使下人类可以如此肆无忌惮拿着自身乃至子孙的性命开玩笑。 　　穹顶之下，你我无法逃离，却也并非没有办法…… ©豆瓣

Chai Jing's documentary about the massive smog problem in China. Chai Jing started making the documentary when her as yet unborn daughter developed a tumour in the womb, which had to be removed very soon after her birth. Chai blames air pollution for the tumour. The film, which combines footage of a lecture with interviews and factory visits, has been compared with Al Gore's An Inconvenient Truth in both its style and likely impact. The film openly criticises state-owned energy companies, steel producers and coal factories, as well as showing the inability of the Ministry of Environmental Protection to act against the big polluters.