Falling levels of air pollution drove decline in California’s tule fog

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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. The findings help explain the puzzling decades-long rise and fall in the number of ‘fog days’ affecting the region over the past century.

Vía Latest Science News — ScienceDaily http://bit.ly/2U8HXYk

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