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Chen Jining, newly appointed minister of environmental protection, is seen in this file photo taken on Apr 25, 2010. [Photo/IC]

The documentary has provoked national discussion after going viral online, turning social media into a hot spot of conflicting views.

"Chai Jing's investigation into smog" remained one of the hottest hashtags on Sina Weibo, a Chinese version of Twitter, while the documentary has been viewed more than 17 million times on Youku, a major Chinese video sharing website.

Critics questioned the former anchor's motives, saying it remained uncertain whether a disease suffered by her young daughter was directly caused by smog in China with rumors circulating that she is a regular smoker, while praise also flooded into Weibo applauding Chai's efforts to inspire the public.

The film became so ubiquitous that Chen Jining, newly appointed minister of environmental protection, said he had called Chai to express his appreciation after watching the whole video.

With smog back in the spotlight, Chen is expected to deal with tons of inquisitive reporters in coming weeks when the nation's legislators hold annual meetings in Beijing.