Wearable air purifier

A wearable air purifier comprising a headgear; an air purifier assembly, the air purifier assembly configured to generate a filtered airflow from an outlet aperture 43 thereof; and a nozzle assembly 100. The nozzle assembly is connected to the headgear by a hinge assembly 116. The nozzle assembly comprising an inlet aperture for receiving the filtered airflow from the outlet aperture of the air purifier assembly and an air outlet for emitting the filtered airflow from the nozzle assembly. The hinge assembly is configured such that the nozzle assembly is movable relative to the headgear between first and second configurations, filtered airflow is emitted from the air outlet in the first configuration and filtered airflow is not emitted from the air outlet in the second configuration. A wearable air purifier is also provided in which the nozzle assembly is rotatably connected to headgear by a hinge assembly and comprises a releasable detent 118 that inhibits rotation of the nozzle assembly relative to the headgear until the detent is released.