January is National Radon Action Month. Radon is the leading cause of lung cancer in non-smokers. It is a naturally occurring radioactive gas formed from the decay of uranium and is found in rock, soil, and water. The Redding Health Department is offering free radon testing for air and water to the first 20 residents who register. The best time to test is during the winter months, during the heating season. Those interested can contact the Redding Health Department at 203-938-2559 or by email at email@example.com.