Unlike chemical fragrances, the absorption of essential oils may improve your respiratory health, sleep, mood, immune system, memory, and concentration. Other essential oils are known to repel insects, reduce pain, stress, and anxiety, decrease bacteria in the environment, and boost energy levels. Heat powered dispersion devices are more useful for filling the room with a natural fragrance. The atomization, evaporation, and ultrasonic methods are traditionally believed to be more beneficial by filling the air with a steady volume of mist. The mist carries traces of the essential oil in the opposite manner of rain carrying pollutants like nitric acid. Essential oils may be toxic if they are consumed directly, making the low volume of absorption from diffusion the optimal method for obtaining the health benefits of it without overexposure.