Many studies, such as this one, that compare nasal to oral breathing deduce that, during exercise, oral breathing tends to be favorable because not enough air can be inhaled through the nose. Even for those of us with physiologically “perfect” noses, nasal breathing during exercise (especially without a nasal dilator) has to be practiced in…

Our noses evolved to be our body’s air conditioners: our nasal passages humidify air and filter out particulates so that the air we inhale into our lungs is as non-irritating as possible. The internal nose alone provides 90% of the respiratory system’s air-conditioning requirement. This means that your lungs and throat have to nearly double…