[moffkalast]

Which ones did you get? I've been thinking along similar lines recently, but they are somewhat expensive and it's hard to say which ones are even legit.

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.

[5e92cb50239222b]

Senseair S8 paired with ESP-32 has served me well over the past 3 years, but they have to be exposed to outside air at least once a week or so. Otherwise they quickly lose their zero point and start reporting thousands of PPM as mere hundreds.

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.

[mrinfinite]

interesting

[snmx999]

I got the Netatmo Smart Indoor Air Quality Monitors. They are somewhat expensive, but I got a good deal, 69 EUR a piece. They also monitor temperature, air humidity and noise levels.

[bartwe]

Airthings, expensive but just does the job perfectly.

[dzhiurgis]

I’m quite happy with Qingping Lite. Doubles as a clock, PM10, charges via USB-C.