Abstract: An atmospheric dispersion model after VDI guidelines in Germany is introduced. This model is a Lagrangian particle model after TA Luf 2002 of Germany. The additional pollutant ground mass concentration from natural draft cooling towers (NDCT) with flue gas injection of 120 m high in Huaneng Beijing Thermoelectric Plant is calculated and, as a parallel calculation, the additional pollutant ground mass concentration from a 240 m high chimney is calculated. The results show that the yearly average pollutant ground mass concentration from a 120 m high cooling tower is lower than that from a 240 m high chimney.