High-Efficiency Particulate Air (HEPA) filters can trap dust, pet dander, mold spores and many other airborne particles responsible for triggering respiratory allergies and asthma attacks. In fact, they are the key feature in some of the best air purifiers on the market. But do HEPA filters remove viruses? If so, can they really stop you from catching a common cold or flu?
The evidence is somewhat mixed.
