Bakersfield residents know that they live with some of the worst air quality in the state, if not the nation. However, smog isn't a problem here in the San Joaquin Valley alone - several other areas of the state struggle with it as well.
Here is a list of the 5 smoggiest air basins in California, based upon the highest national 8-hour average of ozone readings. Data is from the California Air Resources Board iADAM: Air Quality Data Statistics.
For more information, including an interactive air basin map: California Air Basins Map