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For those wanting a cheaper version that is small and works great. I've been using this for a while at home. It integrates nicely with home assistant.

https://community.home-assistant.io/t/sniffer-air-quality-se...

https://github.com/kylemanna/sniffer



Hadn't heard of that but built something similar by adapting tutorials from adafruit for their microcontrollers, lcds, air quality sensors, starting with https://learn.adafruit.com/adafruit-trinkey-qt2040




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