In this study, we analyzed NO_x and SO_x removal efficiencies by a pulsed corona discharge process and investigated the effect of several process variables. The removal efficiencies of NO and SO₂ were measured changing the process variables of initial concentrations of NO, H₂O, and NH₃, SO₂, applied voltage, pulse frequency and residence time. As the applied voltage or the frequency of applied voltage or the residence time increases, the NO and SO₂ removal efficiencies increase. The NO and SO₂ removal efficiencies also increase by the addition of O₂ or H₂O, or by using the large diameter of the discharge electrode. The experimental results can be used as a basis to design the pulsed corona discharge process to remove NO_x, SO_x and VOCs.