Abstract: The device for photocatalytic removal of volatile organic and inorganic contaminations as well as microorganisms especially from air conditioning systems of mechanical vehicles consisting of a plate element applied with a photocatalytic layer as well as a load-carrying element holding a light source in the form of LED diodes emitting UV light, preferably UV-A and/or UV-C, given that between the load-carrying element and the plate element created there is an arterial space, while the light source is mainly directed towards the layer in which the plate element (1) is isolated from the load-carrying element (2) with at least one spacer element (3), preferably applied with a photocatalytic layer. Preferably the external load-carrying element (2) or the external plate element (1) is equipped with a fastening element and the light source (7) consists of LEDs emitting UVis light with wavelength from 410 to 460 nm.