I just want to point out that the other device being compared actually includes a radon sensor and the cost of that device would be cheaper than the airgradient plus the radon sensor.

You can get a cheap analogue radon sensor. As others have pointed out, even if you do detect radon the typical solution is add ventilation.

Which is exactly what you do if you had a high CO2 reading.

Do you have any links to this? I’m very curious.

Just lookup radon test kit and how to deal with radon.

https://kagi.com/search?q=radon+test+kit+&r=us&sh=fA8r72RApl...