“About one in 15 homes in the U.S. has radon levels at or above the the EPA action level, according to the National Cancer Institute. You can’t see or smell radon, and scientists estimate 20,000 lung cancer deaths in the U.S. each year are attributed to it.

Radon is produced from a natural breakdown of uranium in soil, rock and water. It enters homes, offices, schools and other buildings through cracks in floors and walls, construction joints or gaps around service pipes, electrical wires and sump pits.

Radon is the second-leading cause of lung cancer after cigarette smoking. It is an invisible, odorless gas that can seep into various types of structures, including but not limited to basements, slabs and crawl spaces. The only way to know if it is present at dangerous levels is to test for it.”

NSC-National Safety Council (nsc.org)