A Chinese man in front of the the Forbidden City in Beijing
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When will China's hazardous smog lift?

15 January 2013 Last updated at 02:58 GMT

China's media has urged the government to be more open about pollution levels after many northern cities registered dangerous levels of smog in recent days.

In the capital Beijing, some readings were nearly 40 times the World Health Organisation's safe limit, as Damian Grammaticas reports.