Low-voltage operation of a plasma reactor for exhaust gas treatment has been performed by using a multipoint-to-plane geometry device at high frequency. The plasma was produced in a narrow gap by a dielectric barrier discharge of 2–3 kV at 50 kHz. The multipoint electrode has 585 points in the shape of a quadrangular pyramid with 30°. Nitrogen oxide (NOx) removal performance of the reactor was tested for an exhaust gas from a diesel engine generator (20 kV A). The NOx components have been removed with about 100&percent; efficiency of 0.3 mol/kW h from the exhaust gas with NOx concentration of 200 ppm. ©1998 American Institute of Physics.