i'm really glad i got a CO2 monitor; i learned a lot of things in a very short timespan with a reasonably industry-accurate wall unit, which mostly (for now) percolates down to "open your window for 5 minutes after you wake up"
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in reply to @ivym's post:
https://www.amazon.com/dp/B08XH5ZG71 i got this model, it plugs into the wall but there's also apparently a battery powered version! i neglected to check. it can beep if the co2 levels go over acceptable limits as well as having a silent mode. measuring CO2 is basically all it does though
cool info! i went into aliexpress as soon as i saw this and saw like three or four different options but also a couple complaints about precision so… much to think about