Radon is an invisible and odorless radioactive gas produced from the decay of uranium deposits found in most soils. Outdoors, the gas is relatively harmless because it mixes with the air and becomes diluted. Indoors, especially during the winter months when homes are closed tight, radon gas can build to significant levels and prove extremely harmful. The U.S. surgeon general has warned that radon is the second leading cause of lung cancer in the United States.
Testing is the only way to know for sure if a home is safe from radon.
Home test kits can be found at many local hardware and department stores.