By this website, Lanzhou is not too bad.

来源: 于 2013-01-29 11:54:25 [旧帖] [给我悄悄话] 本文已被阅读：次

Shijiazhuang (石家庄):579

is the worst most of the time. instead of HG, maybe it's a good idea to invest environment related companies in china.

http://www.aqicn.info/?city=all