Which of the following is NOT a method to limit radon exposure?

The method of wearing non-fitted respirators is not an effective way to limit radon exposure. Non-fitted respirators, unlike fitted ones, do not create a tight seal around the face, which allows radon gas to infiltrate through the gaps. This means that they cannot adequately protect individuals from inhaling radon gas, which is a primary concern in radon mitigation strategies.

In contrast, ventilating work areas with outdoor air helps dilute the concentration of radon gas, thereby reducing exposure. Restricting installer time in high radon areas minimizes the duration of exposure to elevated radon levels, further enhancing safety. Wearing fit-tested respirators with HEPA filters provides a reliable barrier against inhalation of airborne contaminants, including radon, when properly used. All these methods are effective in reducing radon exposure, highlighting why non-fitted respirators do not serve the intended purpose effectively.