RICHMOND, Va. (WRIC) — January is Radon Action Month, and the American Lung Association urges homeowners to test radon levels.

Radon is a naturally occurring radioactive gas emitted from the ground. Radon can enter a home through cracks in floors, basement walls, foundations, and other openings. According to the American Lung Association, radon is the leading cause of lung cancer in people who have never smoked.

A study by the American Lung Association found 25% of homes tested across Virginia had dangerously high levels of radon gas.

You can measure the radon levels in your home by buying a do-it-yourself kit online. Both short-term and long-term measuring kits are available. You can also contact the Virginia radon program with the Virginia Department of Health to hire a certified radon-testing professional.

To read more about testing radon levels, click BELOW: