In this article, the kinetics of the ozone and hydrogen peroxide-based NO2 removal from flue gas has been evaluated using the wellknown two-film theory. The effectiveness of the rate of absorption of NO2 has been tested by the effect of pH, temperature, H2O2 concentration, and so forth. This study also includes the comparison of the Hatta number (Ha) at various experimental conditions. It was observed that the reaction of NO2 is first order in nature with both ozone and hydrogen peroxide. The effect of SO2 concentration on the absorption of NO2 was negligible. However, the absorption efficiency decreases in the presence of higher SO2 concentration in the peroxone process. The predicted model shows a good fit with the experimental results for various NO2 inlet concentrations. The optimum pH for NO2 absorption for ozonation and peroxone processes was 8. At 318 K, absorption of NO2 shows the maximum value for the ozonation process, whereas for the peroxone process, it was 328 K. The effect of H2O2 on the absorption of NO2 in the aqueous phase was prominent with high Ha values. It was observed that NO2 absorption increases rapidly when H2O2 concentration is increased from 0 to 0.3 mol. L-1. In the zone of 0.5-3.5 mol.L-1 H2O2 concentration, the rate of NO2 absorption was slow.