In partnership with RAdata Analytical Lab and the American Lung Association, Protect Environmental is offering FREE radon test kits to homeowners in select communities across the U.S. Fill out our form and RAdata Analytical Lab will mail you your radon kit and testing instructions. Radon is the leading cause of lung cancer among non-smokers Radon is a naturally occurring radioactive gas and can accumulate to dangerous levels in homes and buildings. Dangerous levels of radon can be found in any home across the U.S. The only way to know your radon level is to test.