How Do Humans Benefit From HEPA Air Purifiers?

We recognize dust and pollen as things that give our bodies fits, but HEPA air purifiers deal with many, less natural pollutants as well. It is difficult for our bodies to detect these tiny particles unless they come across as odors or allergens. Unfortunately for us, there are many things that can damage our respiratory systems that do not register to our senses, and that our bodies have no natural defenses for. This is why we rely on technological devices to clean these particles that other technological devices have put there, in the form of outgassing carpet and furniture dyes, fumes, or anything else.