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@nazgul There are localized phenomena that cause bad air. Zoom around the PurpleAir map and you’ll see em fairly often. But also maybe a bug flew inside.
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@nazgul purpleair.com/map?opt=1/i/mAQI/a10/cC0&select=56705#8.35/48.474/-123.21/-11.6/15 Totally one bum sensor channel.