中文摘要：

建立了非稳态大气流场运动模型，模拟出了不同条件下近地面的浓度场，分析了影响大气污染物扩散的因素。

英文摘要：

This paper establishes the motion model of unsteady-state air flow field, simulates the concentration field near surface in different conditions, and analyzes the factors influencing the diffusion of air pollution.