California has got to find a way to improve their public transportation system and get some of their private vehicles off the roads before they end up with a smog haze that doesn't go away. There is no way you can have that much traffic day after day and not have serious air quality issues. They need to develop an efficient, high speed method of public transportation that they can market to the public.
If the public transportation system in California was less expensive and more efficient than driving your own car, the majority of people would use it for their daily commutes. In so doing, the amount of exhaust from cars would be reduced. However, people must be persuaded to use public transportation in the first place.
The opposite must be true if less public transportation is bad. More public transportation is very good because less people will drive their fuming cars to work and pollute the air. Even trains will produce less because they do not need to burn oil and in turn will not fume.
Yes, I think that improving the public transportation system in California will reduce their local air pollution problem, because there will be fewer cars on the road to pollute. The biggest problem is Los Angeles, and the problem there is the many cars. With public transit, people can find other ways to get to work.
I do not believe improving the public transportation system in California will reduce their local air pollution problem. California is large and it sprawls, I can only imagine how futile public transportation is, especially if you have to go very far. It's impossible to create a system out there that would actually work for the average person. That's why cars and freeways are so popular there.