Three crews of San Ramon Valley Fire Protection District firefighters were sent first to Watsonville and then to Napa/Solano counties to fight a blaze dubbed the "wild" fire.
Residents with respiratory-related health issues are encouraged to limit exposure and exertion while outside, said district spokeswoman Kimberly French.
"It's a good reminder for people to be very cautious and understand that we are under a red flag warning," she said.
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