R A D O N : A H E A LT H H A Z A R D W I T H A S I M P L E S O L U T I O N . Radon is a hazardous, odorless gas that is everywhere! It cannot be seen, tasted or smelled by humans, making it impossible to detect without radon testing. Nearly 1 out of every 15 homes in the U.S. is estimated to have elevated radon levels. W H AT I S R A D O N ? Radon comes from the natural radioactive breakdown of uranium in soil, rocks, and waters. As the breakdown happens, the gas moves into the air you breathe.