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Hello Fedi, 
Do you know anything about *indoors air quality measurement*? 
A few questions here:
- is the "Air Gradient One" truly one of the most exhaustive + affordable option (respectful of people's computing freedom? https://www.airgradient.com/indoor/ Or is there something better?
- is that precise enough that you could move in a space and identify sources of particles? (stashes of devices, windows, carpets, etc?)
- how about mold? is there any DIY solution for those?
@jz if you have a rad1o it can do air quality measurements, i can provide you with an app, that dumps this on the serial port over usb, but i'm sure it's easy to also show it on the display.
@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...
@jz ah, sorry, yeah dust measurements are not included on the rad1o, for that we have additional https://sensor.community/en/sensors/ devices, but for mold? i have no idea. specific particles and gases to measure is also very expensive in my experience.
@jz i've been told for mold there is a probability indicator, from 55% humidity with very low chances of mold to 80% humidity with very high chances of mold. this one is easy to measure, but should be long-term. however if you do suspect mold, then you place a petri dish for 24 hours into the open air of the space to be tested, and using a microscope you look at what develops. but my expert says, if you are more specific, she can give you much better advice probably...