While the Chinese government, the city of Beijing, and the Beijing Organizing Committee of the Olympic Games has worked together on a plan to vastly diminish the amount of pollution in the air in Beijing, it is apparent that nothing has been done yet. Just as an example:
This is a picture from the third floor of the International Broadcast Center. You can see the Olympic Tower and can faintly see the Olympic Stadium (the Bird's Nest), less than a block away, through the flag poles in the background. The Bird's Nest, as you can see, is veiled in fog and mist; that mist is the pollution in the air at around 4pm.