Radon sampling sites are typically located where?

• A. RoofS
• B. Kitchens
• C. Basements
• D. Garages

Answer: (C)

Radon moves from the soil into buildings and tends to accumulate in the lowest, least-ventilated spaces. Because it is denser than air and entry points are usually around the foundation, basements become the areas with the highest and most persistent concentrations, especially when the home is sealed up in winter. Testing on the lowest lived-in level provides the most representative measure of long-term exposure occupants are likely to receive. Sampling in a roof, kitchen, or garage would not accurately reflect the typical indoor radon exposure in living areas—the roof is not a radon entry point, kitchens often have more ventilation, and a garage isn’t a standard living space.