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/…
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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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Replying to @bfgeek
The pollen was pretty bad a week ago when the PM2.5 level was 0, so I don't think so...

Mar 28, 2020 · 4:35 PM UTC