While many homeowners have not heard about radon, it is the leading cause of lung cancer among non-smokers. It is a naturally occurring radioactive gas that has no odor, color or taste and is produced by the breakdown of uranium in soil, rock and water. Uranium is found in all soils and in higher concentrations in granite, shale and phosphates. As it decays into radon gas, it moves through the soil into the atmosphere, where it is harmlessly dispersed in outdoor air or can enter buildings through foundation opening and become trapped inside. When it enters a building, it can accumulate and present a health concern for occupants.