What step should be taken if a long-term radon test reveals results above the action level?

When a long-term radon test indicates results above the action level, it is essential to take immediate action to address the potential health risks associated with elevated radon levels. The correct response is to recommend the installation of a radon mitigation system without delay. This step is crucial because prolonged exposure to high radon levels can significantly increase the risk of lung cancer.

The action level for radon has been established to protect public health. If the results indicate that the levels are above this threshold, it signals that the indoor air quality may pose a health risk. Therefore, mitigating the radon concentration is a priority to create a safer living environment.

While further testing or follow-up tests might be valuable in different contexts, in this case, the presence of elevated radon levels necessitates proactive measures rather than additional evaluation. Postponing testing or assuming further investigation is needed can lead to unnecessary delays and heightened health risks.