The Spare the Air alert Thursday was the eighth one issued by the Bay Area Air Quality Management District in 2023.
Another layer of thick haze greeted Bay Area residents with the sunrise early Thursday, but measuring tools suggested the dirty skies were not filled with as much soot as they were 24 hours earlier.
Whether that trend would continue as the region entered its second straight day with a Spare the Air alert remained uncertain. A shift in winds toward a northerly direction created the possibility that more smoke from wild fires burning in southern Oregon and northwest California could billow into the region, according to weather forecasters. They also brought with them a red-flag warning for fire danger in the northern and eastern parts of Napa County bordering the Sacramento Valley.At 7 a.m.
Some areas of the region — San Francisco , Gilroy in the Santa Clara Valley , Livermore in Alameda County — were under moderately healthy air. Air and weather forecasters with the district said the smoke likely would see its biggest effect near San Francisco and in the South Bay. PurpleAir, a real-time air-measuring company, showed a momentary early morning reading of 219 in Oakland — a figure that means the air is very unhealthy for everyone — and the rest of the region showed figures between 150 and 155, meaning the air is unhealthy for the population.
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