“The primary role of nose hairs is to trap dust, pollen, and other airborne particles in the air so that the air you breathe is partially filtered.”

Dr. Michael Jacobs, associate professor of dermatology, Weill Cornell Medical College

Cornell dermatologist says nose hairs help to filter the air you breathe  Source: HuffPost | You Should Never, Ever Tweeze Or Wax Your Nose Hair. Here's Why. QUOTE