So what is the necessary levels of exposure to have some kind of long term implications? With hand wavy claims to drive fear that certainly will make a pump in

So what is the necessary levels of exposure to have some kind of long term implications? With hand wavy claims to drive fear that certainly will make a pump in radon kits + drive more radon mitigation systems. I've always been under the impression that there was radon in basements since it settles down there ... maybe the correlation is people who spend long periods of time in the basement with radon exposure (thats a guess fwiw).