Abstract: The tropospheric NO₂ concentrations in China region were simulated by applying INTEX-B emission source to the third-generation air quality modeling system (Model3-CMAQ). The simulation results were compared and validated with the tropospheric NO₂ column concentration data from ozone monitoring instrument (OMI). The results indicate that the distributions and seasonal variations of the simulated NO₂ concentrations by applying INTEX-B emission source to Model3-CMAQ are consistent with the observational values from the satellite over China region. The sensitivity tests indicate that the effects of industrial emission and power plant emission on NO₂ concentrations are the most significant, and the effect of traffic emission is far lower than that of industrial emission and power plant emission. Both emission means are mainly concentrated in developed regions of economy such as Beijing, Tianjin and the Yangtze River delta.

Key words: Air quality model, Community multiscale air quality (CMAQ), INTEX-B, Emission source, Tropospheric NO2, Ozone monitoring instrument (OMI), China region