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@stf nice, but what type of sensors? (i could RTFM this...)

As you can see on https://www.airgradient.com/shop/#!/AirGradient-ONE-Indoor-Monitor-Pre-Soldered-Kit-Version-9/p/594725501/category=155176011

the AirGradient One has a
Sensirion SGP41 TVOC/NOx Sensor, a Plantower PMS5003 PM sensor, etc. ... and those are a bit pricey, and chunky. I am pretty sure i would have noticed similar beasts on the Rad10.

If by "air quality" we mean just CO2 and humidity, yeah there are tons of cheap things for that.

I am wondering about thin particles and specific pollutants, and also molds...