When is it preferable to conduct follow-up radon tests?

Conducting follow-up radon tests at various times throughout the year is preferable because it provides a more comprehensive understanding of a property's radon levels across different environmental conditions. Radon concentrations can fluctuate depending on seasonal changes, weather conditions, and variations in building occupancy or ventilation patterns.

Testing at different times allows for capturing these variations, providing a clearer picture of potential radon exposure over time. For instance, radon levels may be higher in winter months when homes are sealed tighter for heating, or they may change during wet weather when the ground is saturated. By utilizing multiple tests throughout the year, homeowners and professionals can make informed decisions regarding radon mitigation and ensure a more accurate assessment of long-term radon risks.

This approach also aligns with recommended practices for radon testing, which emphasize the importance of understanding how radon levels can be affected by changes in conditions rather than relying on a single test at a specific time or condition.