Air cleaner with photo-catalytic oxidizer

An air cleaner comprises an air moving unit (fan) 180 creating an airflow through a channel, a photo-catalytic oxidation (PCO) element disposed in the airflow and an ultraviolet light source 156 used to illuminate the PCO element. The light source may be Ultraviolet A (UV-A) Light Emitting Diode (LED) emitting UV light at wavelengths from 320 - 400 nanometres (nm). The PCO element may be titanium dioxide causing decomposition of water vapour in the airflow. A filter 140 may be provided supporting the PCO element on a first face and a decomposing element on a second face. The decomposing element may be an ozone and/or volatile organic compound (VOC) decomposition element and removes odours. A particulate pre-filter 120 may be provided. The UV LED catalyzes a reaction on the PCO element to clean the VOC decomposing element. The PCO can be a substrate comprising: a first coating comprising a VOC decomposing catalyst; a second coating comprising an ozone decomposing catalyst; and a third coating comprising titanium dioxide. An electrostatic precipitator 130 may be disposed upstream of the PCO element.