What is the recommended action level of radon concentration in pCi/l where mitigation is advised?

The recommended action level for radon concentration where mitigation is advised is established at 4 pCi/l. This guideline is based on research showing that long-term exposure to radon levels at or above this threshold significantly increases the risk of developing lung cancer. National health organizations, including the Environmental Protection Agency (EPA), have set this level to prioritize public health and encourage homeowners to take necessary actions to reduce radon concentrations in their homes. Mitigation can include measures such as improving ventilation, sealing cracks in floors and walls, and installing radon mitigation systems to lower radon concentration effectively. Thus, it is crucial for individuals to test for radon, and when levels reach or exceed 4 pCi/l, they should seek out solutions to lower these levels for the safety of current and future occupants.