Makes me want to cough just looking at it.
And how bad is the air quality? Spectacularly bad:
Beijing's environmental agency said that as of 11:00 local time (03:00 GMT), the PM2.5 reading - which measures pollution in the form of small breathable particles - was 500 micrograms per cubic metre.
The WHO says the maximum safe level should be 25 micrograms per cubic metre.