Abstract
A mathematical model of diffusion by analytical solution was designed by a simple method to compute the pollutants concentration near a point source sited above the ground surface. The other models were surveyed to compare with the proposed model. The following matters are main features of the model.(1) The model satisfies the condition that wind profile may be represented by the power law as a function for the height from the ground surface.(2) The model consists with the Ukeguchi-Ide's model in the condition of emission height=0, of which the diffusion coefficients are represented by specific functions. But it is not necessary to relate diffusion coefficients to parameters in the model.(3) Roberts's model and other models are correspond to the solution of the model under the specific conditions. The relation between diffusion paramers in the model and air current conditions are under consideration by using the results of field tracer experiment near roadway.
