Abstract: A device for the treatment of a flowing gas, such as an exhaust gas, includes at least one pair of smooth electrodes that are arranged opposite each other so that they form between them a discharge space through which a gas flows. For each pair of electrodes, at least one electrode is coated with a dielectric material on a side facing the discharge space. At least one electrode has one or more thickened areas facing the discharge space. The one or more thickened area has at least one opening through which the gas can flow. A device may be used in the cleaning of exhaust gases from internal combustion engines of motor vehicles as well as the cleaning of waste gases of power plants or waste incinerating plants.