A NOx removal method using discharge plasma and electrophoresis for exhaust control was studied. The 65-50% of NO was oxidized to NO2 or HNO3 by the discharge plasma with specific input energy of 45 J/l. The electrophoresis was carried out to concentrate the NO2 or HNO3 adsorbed on the adsorbents. As a result, 80% of the adsorbed nitrate ions were found in the anode region. A combination of molecular sieve pellets of 13X and glass fiber cloth was tested for the collection of nitrate ions. The ability of simultaneous concentration of nitrate ions and sulfate ions using electrophoresis was examined. (C) 2003 Elsevier B.V. All rights reserved.