To what level can most homes be lowered concerning radon?

Most homes can effectively be reduced to a radon level of 4.0 pCi/L, which is significant in the context of radon mitigation and health standards. The U.S. Environmental Protection Agency (EPA) has established 4.0 pCi/L as the action level for radon in residential settings. If radon levels are found to be at or above this level after testing, it is recommended that mitigation measures be taken to reduce the radon concentration.

While lower levels are certainly desirable for health reasons, 4.0 pCi/L represents the threshold at which action is advisable to significantly reduce the risk of long-term radon exposure and associated health issues, such as lung cancer. Significant efforts can bring levels down further, but achieving an exact number lower than 4.0 pCi/L is not guaranteed in all homes, particularly older or poorly ventilated structures. Instead, the focus is typically on bringing levels below this established action level to promote safety.