Diffusion prediction and pollution control measures of fumigation pollutants of wood in train

As a special form of pollution emissions, the fumigation gas of CH₃-Br discharged by log in train causes serious damage to the nervous system and respiratory system of human and animals. This paper took Tongjiang log fumigation site for example, selected body source model of AERMOD to simulate the diffusion of fumigation pollution and analyzed the impact of pollution. Results showed that high concentration of CH₃-Br was centered in the surroundings of fumigation lines and most occurred at night. The farther away from the fumigation line, the lower the excess standard rate of CH₃-Br. With the prediction and the calculated maximum distance, pollution control measures were proposed for the fumigation field.