Abstract: An electronic type ozone generating device utilizing an elongated tube or cylinder having a negative electrode in the form of a fine wire, and a conductive coating on an inner surface of the tube connected to a source of positive potential, whereby air to be ionized forms a dilectric. In contrast to prior art devices in which the air to be treated flows in substantially continuous fashion, means is provided for injecting fixed quantities of air to be treated in pulsed fashion to provide for greater effectiveness. In a second embodiment, means is provided for moving a plurality of fine wire electrodes in an orbital path within the tube relative to the principal axis thereof to provide greater ionization.