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The particle formation and growth combined with plasma chemistry in the pulsed corona discharge process (PCDP) to remove NOx were analyzed by the discrete-sectional model. In the PCDP, most of the NO is converted into NO2 and, later, into HNO3 which reacts with NH3 to form the NH4NO3 particle. In the beginning of the reactor, we have the high concentration of small size particles and, later, the particle size distribution in the reactor becomes bimodal with the large size and small size particles and, finally, becomes monodisperse with the large size particles. As the average electron concentration increases, it takes a shorter reactor length to remove the NOx. As the initial NO and H2O concentrations decrease, the NH3 is consumed more slowly to form the ammonium nitrates particles. As the averaged electron concentration and initial H2O concentration increase, the large size particles grow more quickly and the particle size distribution becomes bimodal earlier. As the initial NO and NH3 concentrations increase, the diameter of large size particles becomes larger by the faster coagulation between particles. The predicted NOx conversion and particle size distribution were in close agreements with the published experimental results at the averaged electron concentration of 2×105 cm-3 in this study.