It's generated from the malfunction of uranium in dirt as well as rocks. It sometimes obtains concentrated in residences built on dirt with natural uranium down payments. It can go into structures with cracks in floorings or wall surfaces, construction joints, or voids in foundations around wires, pumps or pipes.
Opening windows improves air circulation and ventilation, helping move radon out of the house and mixing radon-free outside air with indoor air. Opening basement windows helps reduce negative air pressure, diluting radon with radon health symptoms clean outdoor air.