Radon gas is almost everywhere, but it is much more of a problem in houses that have a basement. The radon gas seeps through the basement floor and walls because it is under pressure in the soil much like water will seep through a crack in a swimming pool. The gas fills up the basement and then seeps into the living space through the floor. It is mitigated by venting the air in the basement to relieve the radon gas pressure. Single story houses with a slab-on-grade foundation are much less likely to have a radon gas problem.
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