Radon is a naturally occurring, radioactive gas that can cause lung and respiratory problems with long- term exposure. It is a colorless, odorless gas undetectable to the human senses. Radon is released from soil, rocks, and water and can enter homes through small cracks and holes in floors, basement walls, and foundations, where it becomes part of the building's air.

According to the American Lung Association, radon is the second leading cause of lung cancer after smoking. And according to the CDC, it is the leading environmental cause of any cancer