Radon

I am familiar with radon. It is a radioactive gas produced by decaying uranium deposits underground and is particularly prevalent in some parts of this country but not mine. It has been linked to cancer especially in significant exposures and if one has comorbidities like being a smoker. The gas is heavier than air so tends to collect in basements of houses which are prevalent in my part of the world. But in this part of Iowa, radon isn't listed as being abundantly around and is more hit and miss in nature. One house can have a problem and another 100 yards away won't. One of the old farmhouses I spent my later teens in had a radon problem but my parents had a mitigation system put in to bring it down to safer levels. When we moved into this house some twelve plus years ago, testing for radon did cross my mind but since this house, as with both houses I've owned, had a walk out basement. In my mind, it meant that any heavier than air radon that accumulated in the basement...