I can remember then I my Nursing Degree classes, one of the function of the nose is purification of Air, second, humidification. Etc..

When the air we breath in has a lot of particles it's create a much work on the nerve senses in the nose and thereafter gives much work load to our lungs.

This is one of the primary courses of malfunction in the lungs and every other underlying ill Health condition can start from there...

This is an amazing and educative as well..