Why has the Bay Area's air quality been getting worse all day today? (It had been really good for most of the last few weeks...) purpleair.com/map?opt=1/m/i/…

Mar 28, 2020 · 5:00 AM UTC

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Replying to @davidbaron
The pollen has been crazy the last few days - but I didn't think they show up at the PM2.5 level. But maybe?
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The pollen was pretty bad a week ago when the PM2.5 level was 0, so I don't think so...
Replying to @davidbaron
Maybe people taking advantage of the looser EPA rules to burn a few tires.
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Replying to @davidbaron
My guess is that everyone is home and burning in their fireplaces.
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