What method is used in quantitative respirator fit testing?

Quantitative respirator fit testing is a method that provides a precise measurement of the fit of a respirator on an individual’s face by using specialized equipment to generate numerical data. This involves measuring the concentration of a test agent inside the respirator versus the concentration outside, thus calculating the level of protection factor provided by the respirator. This method is essential in ensuring that the respirator fits properly and effectively protects the wearer from airborne contaminants.

The other options represent different approaches that do not provide the detailed quantitative data necessary for evaluating the effectiveness of respirator fit. Visual inspection, while helpful for initial assessments, does not provide measurable data regarding the fit. Using smoke to check for fit is a qualitative method, assessing only whether any air leakage is perceptible and not quantitatively determining the actual fit. Likewise, surveying worker comfort does not measure the fit of the respirator but rather gauging comfort levels which can vary independently of the effectiveness of the respirator's seal.