True or False: Testing can begin with short-term testing under closed building conditions.

Short-term radon testing can indeed begin under closed building conditions, making this statement true. Closed building conditions are essential because they help ensure that outdoor radon levels do not affect the accuracy of the test results. In a closed environment, all windows and doors should be kept closed for at least 12 hours before and during the testing period, while also ensuring that any ventilation systems are turned off. This practice provides a stable environment that reflects the indoor radon concentration levels more accurately.

The ability to use short-term testing methods is important because they can yield quick results, allowing for timely decision-making regarding radon mitigation if necessary. This approach is applicable regardless of the age of the home, making it a versatile option for assessing radon levels in both older and newer homes. To summarize, starting with short-term testing under closed building conditions is a standard practice to accurately determine radon levels in residential properties.