The simultaneous removal of NOx and SO2 was demonstrated by an integrated O-3 oxidation/wet atomizing system. The dielectric barrier discharge with silicone rubber dielectrics was used for generating O-3 to oxidize NO and SO2. The O-3 yield and O-3 energy yield were evaluated to be 13.3 g/h and 53.7 g/kWh, respectively. NO was effectively oxidized by O-3, while SO2 was not significantly oxidized because the reaction rate of NO oxidation was much higher than that of SO2. The highest oxidation efficiencies of NO. and SO2 were 97 and 8%, respectively. NOx and SO2 were absorbed as aqueous ions with a mist of H2O2 solution supplied by an ultrasonic humidifier. The total removal efficiencies of NOx and SO2 were 88.8 and 100%, respectively. NO and SO2 were oxidized to NO2, HNO3, N2O5, and SO3 by O-3. These species were absorbed to form NO3-, HSO3-, and SO42- by reactions with the H2O2 solution.