The evidence seems clear: “The Central Valley’s heavy wintertime tule fog – known for snarling traffic and closing schools – has been on the decline over the past 30 years, and falling levels of air pollution are the cause, says a new study by scientists at the University of California, Berkeley,” as was explained in a UC Berkeley press release dated Apr. 10, 2019.
Central California fog as seen from Terra – MODIS satellite in space
“The results help explain the puzzling decades-long rise and fall in the number of ‘fog days’ affecting the region, which increased 85 percent between 1930 to
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