The National Weather Service issued a fog advisory for several parts of the region until 10 a.m. Monday.
The advisory, for hazardous driving conditions due to dense fog causing low visibility, is in effect for North Bay and East Bay interior valleys.
The Sacramento-San Joaquin River Delta, the Northern Salinas Valley, Hollister Valley and Carmel Valley areas are also seeing dense fog Monday morning, the weather service said.
When driving in heavy fog, motorists should slow down, use headlights and leave ample distance between cars ahead of them.
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