Radon can enter residences through splits in floors, structures, or walls, as well as gather inside. It can additionally be launched from building products, or from water obtained from wells that contain radon. Radon levels can be greater in residences that are well shielded, firmly sealed, and/or built on soil abundant in the aspects uranium, thorium, and also radium. Basement as well as very first floors generally have the highest possible radon levels due to their nearness to the ground.