In Wilmington, CA, the pollution from refineries and the port of LA is often so intense that you can smell it within your car as well as see the brown tinge that hangs thick and low in the air driving southbound into the area. Its amazing that people still have to live under that today in this state of supposed environmental leaders both public and private. I guess the port makes too much money for the economy for anyone to care about the health outcomes of the people who are saddled with living near it.
It takes Alpine air as a point of reference to feel it, which says a lot about the ambient level of pollution in cities.