The most of new technologies of reduction of NOx emission, as literature survey (Skalska et al., 2010b) suggests is focused on NOx emission control from power plants and mobile vehicles. Fewer investigations are conducted on the NOx emission abatement from chemical industry. Recently, Chacuk et al. (2007) proposed the model for the nitrous acid oxidation with the use of ozone in gas-liquid contactor. It is well known that not all of NOx can be totally absorbed in water or nitrous/nitric acid solution, as well as ozone is not totally consumed in the acidic liquid. The reaction between ozone and NOx can take place also in the gas phase. The ozone injection into exhaust gas stream followed by absorption was proposed as the NOx emission abatement. The objective of these studies was to propose kinetic model of the process and to determine the rate constants of NOx ozonation in the laboratory scale batch reactor. The process was carried out in the 0.5 dm(3) volume batch reactor for different concentrations of NO, and NO2 and varying molar ratios of O-3/NO at temperature 25 degrees C. Gaseous reagents were analyzed using a Fourier Transform Infrared Spectrometer Jasco FTIR-4200. The kinetic model of NOx ozonation process was proposed and rate constants were estimated based on experimental data. (C) 2011 Elsevier Ltd. All rights reserved.