Where should a radon measurement device be placed during a real estate transaction?

Placing a radon measurement device on the lowest livable level of the house is crucial for obtaining an accurate assessment of radon levels. This level is where radon is most likely to accumulate, particularly in areas where buildings are in contact with the ground, such as basements and ground floors. By measuring radon in these areas, you ensure that the results reflect the exposure that residents are likely to experience in their everyday lives.

The lowest livable level refers to spaces that are inhabited and can include finished basements, which might typically have higher radon concentrations due to their proximity to the ground. This location helps in understanding the actual risk for occupants, as it provides a realistic scenario of radon exposure.

Measuring in other areas, such as the attic or garden, may not accurately reflect residential exposure levels. Attics are generally not lived-in spaces and can have ventilation and environmental factors that reduce radon accumulation. Similarly, radon concentrations in outdoor areas like gardens would typically be much lower and not representative of indoor living conditions. Therefore, for valid and actionable results, the measurement device must be strategically placed where people actually live and spend time.