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Can anyone recommend (ideally inexpensive) devices/kits to measure CO2 and NO2 levels in a residential home?

Ideally capable of sending data to be stored & processed locally (Home Assistant or similar).

if you have a high-uptime PC, you can find USB-enabled SDS011 sensors for $30 on Amazon or anywhere else, and free software that creates a web dashboard that shows VOC count by time. can’t remember if these devices measure CO2/NO2 specifically though.

https://github.com/seandlg/sds011docker

Any other recommendations for stand alone units?

I got a MH-Z19 co2 sensor attached to an esp with esphome, works really well.

Fantastic tip, thanks!

I have a dozen or so ESP32 boards littering my desk left over from a work project, so that sounds perfect :)

Does it measure NO2 though?

Nope, only co2.

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