Abstract: The effective plume height of chimney is an important element in calculating ground level concentration. Now. many plume rise formulas are used in the air quality model. This paper shows the calculation by several plume rise formulas, i. e. Briggs, Holland, Moses and Carson, GB, Lucas, Concawe, Csnady, TVA and calm, with small, middle, large and very large chimneys. A comparison among the calculating results from these formulas has been made with their suitable application spheres given. Based on the data from the calculation a new plume rise formula has been obtained as follows : △H=(0. 92 VsD+5.25F_b^0.4H_s^0.6)/U It can be used widely to air quality model, and gives a satisfatory result