I actually graduated from Vintage High in Napa. Our team was the (grape) Crushers. The sensors in Napa are currently reading in the single digits. It is never that clean.
There has been a change in weather and wind pattern. North Bay was supposed to get slight showers. SF air is completely smokeless now so you smell the shit again.
A lot of really low readings around the bay area.
I wonder if all the smoke knocked the sensors out of calibration?