Beijing air pollution has reach hazard level

Air pollution in the Chinese capital Beijing has reached levels judged as hazardous to human health.

Readings from both official and unofficial monitoring stations suggested that Saturday's pollution has soared past danger levels outlined by the World Health Organization (WHO).

The air tastes of coal dust and car fumes, two of the main sources of pollution, says a BBC correspondent.

Economic growth has left air quality in many cities notoriously poor.

A heavy smog has smothered Beijing for many days, says the BBC's Damian Grammaticas, in the capital.

By Saturday afternoon it was so thick you could see just a few hundred metres in the city centre, our correspondent says, with tower blocks vanishing into the greyness.