Radon is one of the leading contributors in lung cancer and can sneak into your house. The Rock County Public Health Department says radon is an odorless and radioactive gas that can cause illness and death. Environmental Health Specialist Jared Hergert indicates we live where the glaciers deposited everything, so levels in one house may be very different from the next because of the underlying geology. An easy-to-use test kit is available at the health department for those looking to check for radon gas.