What should be done if radon test results are between 4 and 7.9 pCi/L?

When radon test results fall between 4 and 7.9 pCi/L, it is advisable to conduct a follow-up test to confirm the initial findings. This is important because radon levels can fluctuate due to various factors, including weather changes, ventilation patterns, and seasonal variations. Performing a second test, whether it is a short-term or long-term measurement, provides a more reliable indication of radon levels in the dwelling.

Confirming the initial reading allows homeowners and professionals to make informed decisions regarding the need for mitigation and to understand if the radon concentration is consistently elevated or just a temporary spike. Therefore, conducting additional testing in this range is a prudent approach to ensure accurate assessment and subsequent action, if necessary.