Allergies and asthma are two health concerns that could be helped with cleaner indoor air. When airborne irritants are removed, allergy and asthma sufferers often find relief from their symptoms. Even those in good health who may have never suffered from allergies could benefit from clean air. Dust, smoke and other particles float around in the air, causing your drapes and furniture to gather dust. By removing airborne dust particles, you reduce the amount of exposure your respiratory system has to them.