[ZenGum]

Yechhhh.
Beijing's pollution is a mix of industrial/transport smog and desert sand/dust. They're planning to pretty much shut down most of the industry in the lead up to the games and let things clear for a while. They did this for the Asian Games in Shanghai a few years back and it worked pretty well.
But then it will be back to normal. Chinese pollution reaches Japan and sometimes crosses the Pacific and approaches Alaska. Yechhh.