True or False: Testing for radon should be avoided during unusual local severe weather if the test period is less than 4 days.

Testing for radon during unusual local severe weather should typically be avoided if the test period is less than four days due to the potential for significant fluctuations in radon levels caused by such conditions. Severe weather can lead to variations in atmospheric pressure and can disrupt the normal flow of air in and out of a home, which may artificially influence radon readings.

For radon testing, which often depends on stable conditions to accurately gauge average radon levels, having a minimum testing duration allows for capturing an accurate representation of radon concentration. When severe weather occurs, short-term tests are particularly vulnerable to inaccuracies, as they may not reflect typical radon levels when the home is under normal weather conditions. Thus, it's advisable to avoid testing during such periods to ensure reliability and accuracy in the measurement results.

Longer test durations or testing under stable weather conditions generally provide a better picture of the indoor radon levels.