Follow-up testing should be conducted in what type of location compared to the first measurement?

Follow-up testing should be conducted in the same location as the first measurement to ensure consistency and reliability in the results. This approach allows for an accurate assessment of whether radon levels have changed over time and provides confidence in the effectiveness of any mitigation measures that may have been implemented since the initial testing. By using the same testing site, you can compare the new measurements directly with the baseline data, leading to more valid conclusions about the radon exposure in that specific environment. Consistency in location is crucial for identifying trends and understanding the radon dynamics within that space, which cannot be achieved if testing is done in different locations.