AIR - The smog in Los Angeles doesn't quite sting like it used to, but there's still work to be done

For a long time, Los Angeles was synonymous with eye-watering, lung-blackening smog. Things have gotten better over the years, though the air quality in the city is nowhere near ideal.

http://www.treehugger.com/cars/smog--los-angeles-doesnt-quite-sting-it