The Chinese's own air pollution index is at 95, a somewhat high value, especially for recent days. (I don't think anyone thinks the Chinese are accurately reporting their air quality anyway.) On the Chinese scale, this is a "Blue Sky day." (The U.S. would rank it "unhealthy for everyone.")
Chinese authorities prefer to call this "fog."
International Olympic Committee president Jacques Rogge was a master of obfuscation today:
“The fog you see is based on the basis of humidity and heat. It does not mean to say that this fog is the same as pollution. It can be pollution, but the fog doesn’t mean necessarily that it is pollution. Of course, we prefer clean skies, but the most important thing is the health of the athletes being protected.”Baghad Bob could not have done better.