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Last night, the shuttle driver and a co-worker were talking about smog in LA. According to the driver, the smog's only in the valley. He said something about the wind from the ocean blowing it away every where else.

He followed that up by talking about how much more smog there is in New York because of the humidity and the concentration of traffic in a much smaller space.

I left it alone, but laughed to myself a few minutes later when we passed through a tunnel getting off a highway:

The walls were black with a thick layer of soot collected from the exhaust fumes of the million cars that had passed through it. The only clean spots were scrapes and graffiti that industrious taggers carved out of the filth.