[firemanx]

I found Beijing to have poor air, but not nearly as bad as other places in China. Travel out west to Xi'an, and for much of the year it seems as though you can't even see the sky. I heard it told that living there is equivalent to smoking two packs of cigarettes per day. I don't know if that's true, but anecdotally, spending a few weeks there and I was coughing up some of the nastiest stuff I've ever seen from breathing bad air.