Radon is a gas that you cannot smell, taste or see. Radon forms naturally when uranium, radium and thorium break down in rocks, soil and groundwater. People can be exposed to radon primarily from breathing radon in air that comes through cracks and gaps in buildings and homes. Breathing in radon can cause health problems, like lung cancer. Testing your home is the only effective way to find out if you have a radon problem. Read more about radon.
The Tracking Network has radon testing data at the state and county level for some states.Top of Page