Abstract: The AERMOD is a recommended atmospheric simulation model by “a guideline of environment impact assessment: atmospheric environment”. To validate the effect of particulate matter dry deposition on the results of ground concentration predicted by AERMOD model, a coal storage yard in Fuzhou was selected as a non-point source, and the maximum ground concentrations of PM₁₀ and TSP in each grid point within the forecast range were predicted. The results indicate that the ratio of surface TSP concentration with counting dry deposition and without counting dry deposition is 0.13 in all grid points. The same ratio for PM₁₀ is 0.70. The effect of dry deposition is larger on TSP than on PM₁₀. The effect of density on particulate matter dry deposition is significant within the same particle size, while the effect of density increase is larger on dry deposition of inhalable particulate matter than on that of TSP. When the density is higher than 3 g·cm^-3, the PM₁₀/TSP ratios of theaverage ground concentrations are all close to 0.98 in all grid points. The particles diameters larger than 10 μm are almost deposited completely. Thus, the decrease of surface concentration in the grid point is caused by PM₁₀ deposition with the increase of density. The ratio of the surface concentration of PM₁₀  to that of TSP  in the grid point  500 m away from the source center is larger than 0.98 when dry deposition is considered in the AERMOD model, coarse particles larger than 10 μm are almost deposited completely.

Key words: AERMOD, environment impact assessment, dry deposition, density, TSP, PM₁₀, AERMOD, Environment impact assessment, Dry deposition, Density, TSP, PM₁₀