Do you often feel stuffy in your car? dry throat, nasal passages, and skin, a humidifier can make a big difference. Humidifiers are particularly helpful in the car when the air naturally holds less moisture, but they can be used when you are driving. And you could add your fragrance essential oil in the water tank if you want the aromatherapy. The car diffuser uses the latest vapor cool mist humidification technology for soothing moisture on the go.