在爆破后很短时间内形成的蘑菇云和缓慢从爆堆中散发出的爆堆溢出气体构成了爆破毒气的总量.依据气体的运动特点,分别把它们看成是瞬时体积源和不规则体积源.溢出气体扩散采用积分烟团模式,通过模型简化及扩散系数修正,建立了露天矿空气污染评价模型,并利用它对大冶铁矿的爆破进行了较为准确的污染预报. The mushroom cloud formed in a short time after the blasting and the explosive overflow gas from the blast slowly form the total quantity of blasting gas.According to the characteristics of gas movement, they are respectively regarded as instantaneous volume source and irregular volume Based on the integrated smoke pattern, the air pollution assessment model of opencast mine was established by model simplification and diffusion coefficient correction, and the accurate prediction of pollution was carried out by using it.