Aside from filtering, warming, and humidifying the air you breathe, the nose is your first line of defense against allergens and pathogens. The mucus and cilia inside are designed to block these outside invaders from going farther down the respiratory tract and making you sick. And NO, which is what the sinuses release when you breathe through your nose, is a vasodilator, meaning it relaxes the blood vessels and lowers blood pressure.
I love this article so much. I started nasal breathing a few months ago, and it’s definitely helped with my overall fitness. At least, I get out of breath much less frequently.
Anyway, great read.