How Your Ancestors’ Environment Determines The Shape Of Your Nose

This makes sense, considering that one of the central functions of the nose is to filter and condition inhaled air before it reaches the lower respiratory tract. Air should be warm and moist when it enters the body, and a narrower nose can more effectively condition cold, dry air in this manner. Therefore, people in colder climates who had narrower nose would be more likely to survive and reproduce than those with wider nostrils. So, among peoples living further from the equator, evolution would favor narrower noses.