What advisories should be included in a report if low radon concentrations are detected?

When evaluating radon levels in a home, it is important to understand the implications of varying concentrations. The choice indicating that advisories should be included for levels between 2-4 pCi/L is correct because radon levels in this range are not immediately regarded as urgent but still pose a potential risk for long-term exposure.

The EPA recommends taking action when radon levels are at or above 4 pCi/L, where the risk of lung cancer increases significantly. However, levels that fall between 2-4 pCi/L suggest that while they are not critically hazardous, they are still above the ideal level of zero. This makes it advisable for homeowners to consider mitigation options, as prolonged exposure—even at these lower levels—can contribute to health risks over time.

Including suggestions for further evaluation or remediation, even at 2-4 pCi/L, allows homeowners to make informed decisions to protect their health. It encourages proactive management of indoor air quality and underscores the importance of awareness regarding the risks associated with radon exposure. Therefore, the recommendation to "consider fixing if between 2-4" emphasizes the need for vigilance rather than complacency regarding radon levels, making it the most appropriate choice.