True or False: The home should be re-tested on a lower level if the occupants begin using that level more frequently.

• A. False
• B. True
• C. Maybe
• D. Not applicable

Answer: (B)

Re-testing a lower level of a home for radon can be important, especially if that area has started to be used more frequently. Radon levels can vary based on factors such as occupancy and changes in ventilation. Increased activity in the lower level could lead to changes in air pressure and, consequently, variations in radon concentration. Testing provides accurate data to ensure that occupants are not exposed to harmful levels of radon, particularly if the usage has changed since the last test. Ensuring the safety of the living environment is vital, given that radon exposure is a health hazard. Therefore, the answer is true: a lower level should be re-tested if it is being used more often.