About that study finding less fog in Los Angeles...
I grew up on the east side of town (Montebello) and remember some very foggy nights as late as perhaps the early 1970's. Certain pockets of fog were more dense than others and you couldn't see farther than 10 feet. You could feel the cool wetness on your face. It was beautiful. Couldn't drive very fast on surface streets. I vividly remember driving south on the 110 through downtown watching the nighttime fog swirling around the high-rise buildings. I haven't seen that kind of fog here in 20 years.
The smog is better than it used to be, but the east valleys still have pretty bad air compared to the Westside.