You're wrong, radon isn't only found in coal mines. Testing has revealed that in some parts of the world there are very high radon levels in basements. This

You're wrong, radon isn't only found in coal mines. Testing has revealed that in some parts of the world there are very high radon levels in basements. This isn't true everywhere, it depends on local geological conditions. The mutagenic qualities of these radioactive isotopes is settled science.