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This question is like asking how much smoking is harmful. There is no exact answer. Damage begins immediately. More exposure equals more damage. And this is exactly the problem with radon. It doesn't kill directly like, say, poison from a venomous reptile. The radioactive inert gas has a short half-life, and, when breathed in at measureable concentrations even below the recommended limit, some radon undergoes decay in the lungs. This irradiates surrounding tissue. The radioactive daughters of radon will also cause damage when they decay inside the body. The recommended limit of radon contamination in air is 4pCi/l (4 picocuries/litre of air). Even at this level and a bit lower, a wise homeowner would immediately get a consultation and seriously consider an option to deploy radon mitigation technology to reduce the level even more.

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