What best describes qualitative testing of respirator air quality?

• A. Qualitative testing relies on sensory perception, such as smelling irritants, to assess air quality.
• B. Quantitative testing uses meters to measure pollutant concentrations inside and outside the respirator.
• C. Qualitative testing uses colorimetric strips to indicate irritants.
• D. Quantitative testing relies on subjective judgments by the wearer.

Answer: (A)

Qualitative testing of respirator air quality relies on human senses to detect contaminants rather than measuring exact concentrations with instruments. In this approach, a test agent that can be perceived—such as an irritant or odor—is introduced, and if the wearer can detect it, the air quality is considered inadequate for the respirator conditions. This is why relying on sensory perception like smelling irritants is the best description. The other ideas describe quantitative methods (using meters to measure pollutant levels) or imply alternative detection methods that are not the standard qualitative approach, or mix subjective judgments with objective measurements.