An ultrasonic diffuser apparatus uses ultrasonic waves to aerosolize nano-emulsified cannabinoids into airborne nanoparticles. The apparatus includes at least: a base housing to house electronic components, a CBD storage compartment communicative with the base housing, and a cover removably mated with the CBD storage compartment. The cover includes an interior cavity and an exhaust outlet. The aerosolized CBD oil solution collects within the interior cavity and is expelled through the exhaust outlet where it is absorbed through the skin, mucus membranes and lungs of persons in a substantially closed room.