Abstract: A humidifier is provided having a base including a chamber for receiving water, at least one reservoir removably mounted on the base for providing water to the base chamber, and an atomizer provided in the base for aerosolizing water from the base chamber. A duct is removably mounted on the base, the duct enclosing the atomizer and venting humidified air from the humidifier. An anti-contamination system is in communication with the duct and includes a housing, an ultraviolet (UV) light source mounted within the housing for emitting UV light to interact with at least one of the aerosolized water and humidified air, and a window at least partially transparent to UV light provided between the anti-contamination system and the duct. Embodiments may include a reflective member provided within the housing for reflecting UV light through the window.