Radon is a very dangerous invisible gas that needs to be eliminated from your home. Long-term exposure to radon can increase your risk of lung cancer. Fortunately, there are residential radon mitigation systems you can install that will protect your home. But you will want to make sure that the system is installed correctly.  1. Seal Your Cracks Radon mitigation begins with testing your home radon levels. If they are not very high, you might simply want to seal any cracks in your home and this might be enough to stop the infiltration of radon gas.