An air cleaner is an electric appliance for the ionization of room air with dust binding effect. During the process, ozone is generated which does not only have a disinfecting effect but can also decompose odor-forming molecules. The main electric processing unit is the ionizer which causes alternating electric and magnetic fields at the fundamental frequency of 50 Hz respective 60 Hz through high voltage. Further, non-electrical components are e.g. an active carbon filter that restrains the spread of bacteria and mould spores or a photocatalytic filter for disinfection.