What steps should be taken if both radon results exceed 4 pCi/L?

When both radon results exceed 4 pCi/L, the appropriate course of action is to report the results and recommend immediate mitigation. This is based on the understanding that a radon level above 4 pCi/L is considered a health risk according to guidelines established by the Environmental Protection Agency (EPA).

Immediate action is required because prolonged exposure to radon gas at these levels can lead to serious health issues, including lung cancer. It is vital to communicate these findings clearly and to initiate steps for mitigation to ensure the safety and health of the occupants.

Calculating the Relative Percent Difference (RPD) is valuable in some contexts, particularly to assess reliability and the consistency of multiple readings. However, in instances where radon levels exceed the action threshold of 4 pCi/L, it is not a sufficient response to rely solely on RPD calculations before making a recommendation. Instead, the focus should be on mitigation to reduce exposure promptly.

In contexts where you simply average results, this approach fails to address the immediate health risks posed by high radon levels since averaging can obscure critical spikes in radon concentration. Therefore, understanding the urgency of mitigation when faced with high radon levels is crucial for ensuring safety and health.