When should average measurements be utilized for mitigation decisions?

Using average measurements for mitigation decisions is most appropriate when two side-by-side tests are performed in the same location. This scenario ensures that the radon levels are being assessed under similar environmental and structural conditions, providing a more reliable comparison of the results. When both devices are measuring the radon levels in the same immediate area, averaging those results can help account for any small fluctuations or variances that might occur due to factors such as slight changes in air pressure, humidity, or temperature, which can influence radon readings.

Mitigation decisions should be based on reliable data, and having two measurements from the same location allows for a better assessment of whether the action level has truly been exceeded. If one device showed a high reading while the other did not, averaging can give a clearer picture of the radon levels present, determining if further action is necessary.

In contrast, relying on readings from different locations, only one test, or both devices showing results below the action level would not provide the same level of assurance needed for informed decision-making regarding mitigation.