Researchers at Monell Chemical Senses Center have figured out that nasal congestion is influenced by more than just nasal airflow. Apparently temperature and humidity influence the perception of nasal congestion just as much as how physically obstructed the nose is. By having volunteers breath air with variations in temperature and humidity, they have determined that cool and dry air minimizes nasal congestion without any change in how open the nasal cavity is. By taking into account …