Associated Press: Beijing's skyscrapers receded into a dense gray smog on Thursday as the capital suffered the season's first wave of extremely dangerous pollution, with the concentration of toxic small particles registering more than two dozen times the level considered safe.
The air took on an acrid odour and many of the city's commuters wore industrial strength face masks as they headed to work.
The city's air quality is often poor, especially in winter when stagnant weather patterns combine with an increase...