The LA haze over the oceans is not grubby (except perhaps in appearance). LA was hazy when the first Western explorers arrive. The breeze comes from the west for about 350 days/year after blowing across about 5,000 miles of ocean - it has some humidity, but not significant pollutants. Then, for every miles you go inland, the car pollution mounts, and then it all gets scooped up against the mountains.
Oh, and no mosquitos either!