radon home sale

https://foxtrot-wiki.win/index.php/Understanding_Radon_Levels_St_Louis_County:_A_Homeowner%27s_Guide_to_Testing_and_Mitigation

When selling my house, the radon test came back high, and I had to deal with a whole new set of complications. The potential buyer wanted proof that a mitigation system was installed and working, so I scrambled to get it done and retest before closing. It was a stressful extra step that almost derailed the sale.