Really. The best to read - most perceptive and knowledgeable - is James Fallows of the Atlantic Monthly. He is the go-to guy for the Beijing Olympics.
Here's the link to his blog.
He has been in China for some time.
He is a VERY smart guy (wrote Blind into Baghdad and the 51st State). Both articles were prescient. Scarily so. Scary because it meant that anyone who spent the time investigating could have predicted the aftermath of the invasion.
Northern winds are preferable to keep the Chinese pollution away.