What is the EPA action level for radon?

The Environmental Protection Agency (EPA) has established an action level for radon at 4 picocuries per liter (pCi/L). This level is significant because it serves as a guideline indicating when radon mitigation measures should be taken to reduce radon levels in homes and buildings. When radon concentrations reach or exceed this threshold, the EPA recommends homeowners take necessary actions to mitigate the radon exposure, as prolonged exposure to elevated radon levels is associated with an increased risk of lung cancer.

The rationale behind setting the action level at 4 pCi/L takes into account both the health risks associated with radon exposure and the feasibility of implementing effective mitigation strategies. Monitoring radon levels and taking action if they are at or above this level is essential for maintaining indoor air quality and minimizing health risks related to radon.