What is the action level of radon in pCi/L that requires immediate remediation if a time-sensitive test meets or exceeds?

The action level for radon is established at 4.0 pCi/L, which indicates the concentration of radon in the air that, if met or exceeded in a time-sensitive test, requires immediate remediation. This threshold is based on health guidelines set by the U.S. Environmental Protection Agency (EPA) and other health organizations. Long-term exposure to radon levels above this action level significantly increases the risk of lung cancer, making it essential to take corrective actions to reduce radon levels in affected homes or buildings.

When testing for radon, if results show levels at or above 4.0 pCi/L, it is recommended that homeowners take steps such as radon mitigation measures to lower the levels to safer concentrations. This proactive approach is crucial for ensuring indoor air quality and public health safety in residential and commercial properties.