What is generally considered a high radon level that may require remediation?

A radon level of 4.0 picocuries per liter (pCi/L) is recognized by both the Environmental Protection Agency (EPA) and health organizations as the action level at which remediation is recommended. Levels at or above this threshold pose a potential health risk, as long-term exposure to elevated radon levels can lead to lung cancer.

The significance of 4.0 pCi/L is based on studies that correlate radon exposure with increased lung cancer rates. Therefore, when homes or buildings are tested and found to have radon concentrations at or above this level, it is advisable for homeowners to take remedial action, such as installing radon mitigation systems, to reduce those levels.

This standard is crucial for effective public health policy, as it helps to minimize risks associated with radon exposure. Monitoring and addressing radon levels at this established threshold plays a vital role in ensuring safety and health for occupants of residential and commercial properties.