Environmental Law Institute
According to the U.S. EPA, indoor radon exposure results in an estimated 21,000 lung cancer deaths in the United States each year. That makes indoor radon the second leading cause of lung cancer, the leading cause of lung cancer among non-smokers, and the seventh leading cause of cancer mortality overall.
Radon is a colorless, odorless gas that is produced from the decay of radium released from uranium ore that is present in most rock and soils. When radon enters a building through cracks or other openings in the foundation or slab, it becomes concentrated indoors. Inhaling radon over a period of years increases cancer risk; the higher the radon levels, the greater the risk.
