People ride along a street on a smoggy day in Daqing
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China smog: Disruption across northern city of Harbin

21 October 2013 Last updated at 21:49 BST

There has been widespread disruption across northern China as smog brought roads and flights to a standstill.

Schools were also forced to close after visibility in parts of the northern city of Harbin in Heilongjiang province was reduced below 50m (160ft).

Celia Hatton reports.