Where does oxygen go when it leaves your nose?

In exhaling, the oxygen mixes with the surrounding atmosphere. On inspiration, the oxygen, along with other gasses present, enters the nose and gets warmed and moisturised while dust is filtered out. After that it leaves the nasal cavity and enters the pharynx, just behind the soft palate and the tongue, and eventually passes down the larynx into the (lungs,) bronchi and through the alveoli into the bloodstream.