Los Angeles preview

USA

Los Angeles is infamous for its air pollution, mostly due to the countless automobiles on the road on a daily basis. The term "smog" got its birth in Los Angeles because of the brown mixture of smoke and fog that lingers in the sky on hazy days. In recent years, the city has taken drastic measures to clean up the air, one being the use of one of the nation's cleanest public transit systems.

Los Angeles has still a long way to go and no one really expects the air quality to change much until the city builds a p…