What is a primary function of HEPA filters?

The primary function of HEPA (High-Efficiency Particulate Air) filters is to remove bacteria and other very small particles from the air, making option B the correct choice. HEPA filters are designed to trap a minimum of 99.97% of particles that are 0.3 microns in size. This capability makes them highly effective for improving air quality, particularly in environments such as hospitals, laboratories, and clean rooms where maintaining a sterile environment is crucial.

While regulating humidity levels is important for overall air quality, it is not the function of HEPA filters. Similarly, maintaining temperature stability is not within the scope of what HEPA filters do; instead, air conditioning systems handle that aspect. Testing chemical reactions is unrelated to air filtration, as it pertains to a separate area of science and is not a primary function of HEPA filters. Thus, the focus of HEPA filters is specifically on filtering out harmful particles, including bacteria, from the air.