Radon from soil gas is the main cause of radon problems. Radon gas typically moves up through the ground to the air above and into your home through cracks and other holes in the foundation. Your home traps radon inside, where it can build up to harmful levels. Any home may have a radon problem. This means new and old homes, well-sealed and drafty homes, and homes with or without basements.
Homes but on slabs are often overlooked, because, we travel in and out of the home through the front, back and garage doors, and windows are often opened to let in fresh air for air exchange. Air exchange with the exterior prevents the buildup of harmful levels of Radon Gas. None the less, in the south most people seem to leave their windows closed and strictly run their HVAC systems, preventing any significant exchange of air with the exterior. Even if your home is on a slab you should have your radon levels checked.