The inhaled air encounters which of the flowing first?

The correct path of inhaled air is: external nostril → nasal chamber → internal nostril → pharynx → larynx → trachea → primary bronchus → secondary bronchus → tertiary bronchus → primary bronchiole → secondary bronchiole → tertiary bronchiole → terminal bronchiole → respiratory bronchiole → alveolar duct → alveolar sac → alveolus.