Schools in Beijing are to close and outdoor construction to stop after the Chinese capital issued its first "red alert" over smog levels.

The red alert is the highest possible, and has not been used in the city before, the state-run Xinhua news agency says.

Authorities expect more than three consecutive days of severe smog.

Cars with odd and even number plates will be banned from driving on alternate days.

The alert comes as China, the world's largest polluter, takes part in talks on carbon emissions in Paris.

Current pollution levels in Beijing are actually lower than last week's, but the red alert has been placed because of levels expected over the coming days.

(BBC)