Noses are portals, between the inner world and the outer world. The function of breath invites awareness. Each breath allows contact with the environment and points attention to our body.
Breathing wintertime air can be an experience of breathing air from over baked interior environments, to cool wet/cold dry outside environments. Wintertime is an opportunity time to tend to your nose, and tend to your awareness.
A simple practice of breath awareness is Alternative Nasal Breathing.
Place the thumb of the right hand over the right nostril, middle finger of the same hand over the left nostril. Cover one nostril and close it, exhale through the open nostril. Then inhale through the same nostril. At the end of the inhale, close that nostril and open the opposite nostril. Exhale then inhale through the same nostril. Do this cycle three times each nostril. Notice your breath, and the inhale/exhale.
I am breathing the moist air of maritime pacific northwest. What is your air like?