WATERTOWN, N.Y. (WWNY) - When was the last time you checked your home for radon?
If you haven't recently, Jefferson County Public Health is urging you to and offering 100 free test kits.
Radon is a radioactive gas that comes from the ground. It's odorless, colorless and tasteless. It can only be found through testing.
Officials say radon builds up this time of year.
"So the winter time is when you're going to have more of a buildup of gas, particularly in newer homes that are more air-tight. So that's why it's even more important to test, and of course we want to test in the winter because then we're going to get the most that we're being exposed to," said Faith Lustik, public health planner.
It is the second leading cause of lung cancer.