Five Ways The Nose Freshens Air

  1. Nostril hairs work like a net to catch pollen, insect bits, and skin flakes.
  2. Sticky mucus lining the nasal cavity traps bacteria, viruses, and dust particles.
  3. Hair-like cilia in the nasal lining move from side to side to waft germ-laden mucus to the throat, where it is swallowed and treated to an acid bath in the stomach.
  4. Blood vessels lining the nasal cavity act like radiators to warm the air-especially useful on cold days.
  5. The nasal lining loses water vapour to make even the driest air moist.