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Since there is no known safe level of radon, there can always be some risk, but the risk can be reduced by lowering the radon level in your home. A variety of methods are used to reduce radon in your home. In some cases, sealing cracks in floors and walls may help to reduce radon. In other cases, simple systems using pipes and fans may be used to reduce radon. Such systems are called sub-slab depressurization, and do not require major changes to your home.
People should take action to lower radon levels in the home if the level is 4.0 pCi/L or higher. The EPA estimates that nearly 1 out of every 15 homes in the United States has elevated radon levels. Outdoors, radon generally disperses and does not reach high levels.