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"More than 150 flights to and from Beijing were cancelled or delayed Tuesday as a thick cloud of acrid smog shrouded the city, with US figures saying the pollution was so bad it was off the scale.
The national meteorological centre said the Chinese capital had been hit by thick fog that reduced visibility to as little as 200 metres (650 feet) in some parts of the city, while official data judged air quality to be "good".
But the US embassy, which has its own pollution measuring system, said on its Twitter feed that the concentration of the smallest, most dangerous particles in the air was "beyond index" for most of the morning."
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