Air pollution episodes in a region depends heavily on local meteorological conditions. Therefore it is interesting to compare air pollution potential among 15 climatological regions in Taiwan. A simplified climatological dispersion model (TCM) is used to estimate long term average ground concentration. Typical stacks with various heights and emission rates located in the center of each climatological zone are assumed to be the pollution sources. Hourly meteorological data for the CWB and CAA weather stations in 2001 are used in this study. The maximum ground concentrations are used as an index for the intercomparison of the air pollution potential. Finally, the diurnal and seasonal variation of the air pollution potential is also discussed.