There is some foreshortening in this image as I have zoomed in a bit on the stadium, but I am standing no more than 100 yards / meters from the bird's nest. Yahoo's weather report coyly refers to this kind of Beijing day as "foggy". Ha ha ha. On its English language website recently, Xinhua - the Chinese "news" agency operated by the Chinese government - tells us that Beijing air quality is better than ever with more and more blue sky days all the time. Ha ha ha...