I wound up grabbing a couple of AirThings sensors to see what my indoor air quality looks like. Those things can be a bit pricey, but they are easy to interface

I wound up grabbing a couple of AirThings sensors to see what my indoor air quality looks like. Those things can be a bit pricey, but they are easy to interface with locally and integrate into Home Assistant, providing you with measures for a few different properties. I found that the radon levels in my basement rarely breach 2 pCi/L, but can breach as high as 4 pCi/L very infrequently (i.e. once a year.) Not sure if there is really any point in being concerned about it, but it's interesting information nonetheless.