Radon starts out as a heavy metal called uranium, then turns into an invisible radioactive gas that you can't smell, see or taste. This process occurs when the uranium decays and turns into another metal called radium. Then as the radium breaks down, it becomes radon. Some areas of the country have higher concentrations of radon gas. Hamilton county in Ohio is labeled as zone 1 by the EPA (view interactive map here). Structures that are built from the ground up, such as home