Several thousand times over the past 18 months I've posted shots out the back window of our apartment in Beijing, as ways of illustrating the air quality, or lack thereof, in the big city. For instance, this one back in March:

For the record, here's how the same scene looks from the opposite direction. This is a shot back toward our apartment window, which is almost exactly in the middle of the frame, taken from a pedestrian walkway over a big road just murkily visible in the shot above. The low, reddish-colored, Mao-era building in the foreground of the second view is the same one in the bottom center of the first.

And as we leave the apartment for the last time (I'm scheduling this post for the minute we get in the taxi for the airport), a clearer-sky view out the back from this past weekend. In this view it's possible to see the overpass, and a lot more -- including the arched bridge over the canal shown two days ago. Unfortunately, today the air is back to blear.