Final answer:
The correct level of the home to test for radon is the basement. Radon gas accumulates in basements, making testing the basement crucial to determine if the radon level is elevated. Elevated radon levels in a home can be as harmful to health as smoking a carton of cigarettes a day.
Step-by-step explanation:
The correct level of the home to test for radon is the basement.
Radon gas can diffuse from the soil into homes, especially basements, because it is about eight times more dense than air. Since radon accumulates in basements and lower floors, testing the basement is crucial to determine if the radon level is elevated.
Elevated radon levels in a home can be as harmful to health as smoking a carton of cigarettes a day, and it is the number one cause of lung cancer in nonsmokers and the second leading cause of lung cancer overall.