CO2 sensors for every room in my apartment. Before monitoring the CO2 levels I did not realize the relation of tiredness, mental fatigue and high CO2 levels.
So far the MH-Z19 modules are on the top of my list for pairing with an ESP or something and logging data to NAS but I've yet to order any.
I think other models with auto-recalibration also suffer from this (including MH-Z19). It's probably not a problem for you, but if you too live in an extremely polluted area and have to keep your windows shut for weeks at a time, it might be.
At a company I used to work for we started wonder why one meeting room got especially rowdy if we had our 2 hour team meeting there.
Had the building management install a CO2 sensor, it got up to 1500ppm. We were practically drunk in there. Turned out it wasn't meant as a meeting room at all and it had zero ventilation ducts - they were all in the room next door, they had just slapped a wall to split it into two.
It might make you feel different - and maybe not great for being productive, but it would be hard to notice.
After getting meter I found it’s def not enough, especially in rooms with more people doing some activity. He still doesn’t believe my meter is accurate tho.
We updated our air exchanger to fix the problem. Venmar and Vanee are two big brands in america.
You can get it down to 400ppm even with people in the apt.
What sort of levels is it inside? Isn't it inert? (hence the problem of global warming)