Smog and the city: Beijing's ongoing battle
Those living in Beijing are used to dealing with cold temperatures and harsh winds in the winter. But for the past few years, a new hazard can't be ignored: noxious air pollution.
Smog levels in China's capital city hit hazardous highs for the first time this season on Thursday.
Air pollution readings measured more than 20 times the limit considered safe by the World Health Organisation.
Celia Hatton spoke to local residents to see how they were handling the problem.