Abstract:The organized and unorganized sources in one copper smelter were monitored. Diffusion of heavy metal pollutants in the copper smelting plant were simulated by AERMOD air quality model to verify the rationality of particle size grading for heavy metal pollutants in exhaust gas of copper smelting plants by comparison between prediction value and monitoring value of copper smelting plant environmental air quality concentration. The results demonstrate that particle size of heavy metal pollutants has significant influence on air quality concentration of copper smelting plants. AERMOD model is capable to simulate diffusion of heavy metal pollutants in one “double flash” copper smelter with parameter of particle size of lead, copper, zinc, and arsenic of quality percentage of 25% and quality particle median diameter of 8 μm.