This is the time when many people make New Year's resolutions, and state environmental officials are hoping one of them is having your home tested for Radon. Radon is a colorless, odorless gas that occurs naturally in all 67 counties in Pennsylvania. January is Radon Action Month, and the simplest step for homeowners is to get a Radon test kit at any hardware store or home center. If levels are above normal, you'll be advised to call in a mitigation professional. According to the EPA, Radon is the second leading cause of lung cancer in the US.