For two short-term radon tests, how should they be conducted?

Conducting two short-term radon tests at the same time and location, 4-8 inches apart is the best practice for ensuring that the data collected provides a reliable assessment of radon levels in a home or building. By placing the tests close to each other in the same environment, you can account for any localized variations in radon concentration that may occur within the space. This positioning helps to create a more consistent comparative analysis of the radon levels, making it easier to identify any discrepancies in the readings that might arise from environmental factors or testing device performance.

Testing at different times or locations could lead to variability in results due to changes in factors such as weather conditions, building occupancy, or ventilation practices, all of which can influence radon levels. The goal of placing the tests in close proximity is to minimize these variables and achieve an accurate assessment of radon exposure in a specific area.