I have a CO₂ meter now. Without ventilation that stuff accumulates quickly! Just being sedentary in the larger living room, close to 200 ppm per hour. I’ll have to let it run for a while to see actual peaks, but it’s a perfectly straight slope implying I’ve been dealing with many thousands of ppm every day for years, because I gave up keeping ventilation open due to smokers. (Just trying to find one or two moments a day which still get ruined quite often.)
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