Bay Area air quality has been a mess these past few days.

5:56 PM · Nov 30, 2021

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Replying to @kfury
#lazyweb is it an inversion layer situation? Looks like pollution trapped in there between hills/mountains.
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I think so. It definitely seems temperature-related and comes and goes quickly. This morning was also really foggy, which might make PurpleAir’s laser-based sensors read high.
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Replying to @kfury
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GIF
Replying to @kfury
do you have one of their sensors, or do you just check their readings?
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I've built a few AQI monitors that use the exact same sensor they use. This is my 24-hour chart:
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