It's been very foggy across Central California this winter, with the longest stretch of non-stop foggy days since the 1970s. But why has it been so foggy?

Atmospheric conditions in the Bay Area prompted air quality regulators to issue a Spare the Air alert for Thursday, which ...

"High pressure causes the air to sink," Hall explained. "It creates basically a cap or a lid over the Bay Area, and there's not much of a wind to help mix things out. Then you add on top of that some ...

Meteorologists at the National Weather Service may have an answer for Bay Area residents regarding Thursday's poor air quality. Roger Gass, a meteorologist with the National Weather Service in the San ...

Weather conditions trapping wood smoke pollution near the ground prompted the Bay Area Air District to issue a Spare the Air alert Thursday. Light winds and cold overnight temperatures were expected ...