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@yosh my airvisual pro stopped measuring pm2.5 concentrations a couple of years ago (internal fan doesn’t spin, or something), but the co2 sensor is still fine. with the bedroom windows and doors closed at night for 12 hours, the co2 level climbs to over 1200 by the morning.

i don’t have a choice here – my pm2.5 levels stay over 200 for several weeks on end in the winter months. i have a good air purifier, but it doesn’t do anything for co2.