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I'm a fan of the airgradient, they offer a very nice DIY. You can build a quality sensor for under $50.

https://www.airgradient.com/diy/

Components:

    Wemos D1 Mini USD 2.24
    Wemos OLED display USD 2.47
    Plantower PMS5003 PM Sensor USD 13.89
    Senseair S8 CO2 Sensor USD 28.00
    SHT30 or SHT31 Temperature and Humidity Sensor Module USD 2.55
I think the lead article was posted by the founder of airgradient. I've had some email exchanges with him, he is supportive and helpful.


I can also attest to the inexpensive simplicity (and decent reliability) of the AirGradient sensors.


That looks like a great kit! It's that Senseair S8 a real CO2 sensor though? It's a bit cheap, most in that price range are just estimated (eCO2)


The S8 is a high quality NDIR CO2 sensor often used in professional air quality monitors.




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