2006年4月16日晚至17日晨北京等地发生强降尘事件，为了解与这次浮尘事件有关的粉尘释放、传输和沉降过程，收集了这次强降尘事件的样品，并进行了系统的分析和测试，研究表明：此次降全事件的强度为14.8-15.0g/m2，约占全年总降尘量的10%，其降尘量之大实属罕见，使得北京地区可吸入颗粒物急剧上升，空气质量达到重度污染，通过SEM对粉尘粒度与形态特征的观察发现，粉尘形态主要为棱角状、次棱角状和次圆状：粉尘平均粒径为12um.>50um的沙粒含量接近50%，颗粒粗，含沙量高是这次强降尘事件的显著特征，是导致降尘强度大的主要原四。主要矿物成分为：SiO2.AL,SIyOg.CaCO.根据卫星影像所反映的粉尘云出现区域，阿拉善东部和鄂尔多斯高原风沙区很可能是这次沙尘事件的主要来源地。

From the night April 16 to the morning April 17, 2006, an intense dustfall event occurred in Beijing. To investigate the source, transport and deposition of aeolian dust in this event, we analyzed and measured the intensity of dustfall by collecting dust samples. Based on 10 measurements,the averaged intensity of dustfall in this event was 14.8-15.0 g/m’,taking up about 10% of the total annual dustfall flux in Beij ing. The dust particles were mostly angular, subangular,and subrounded in shape,and the MMD was nearly 12 μm.In the samples of the observed dust event, particles with MMD <10 um were 55% by number, the fine sand particles larger than 50 μm,however,made up almost 50% by weight.High content of fine sand particles might be the reason for the intense dustfall in this event. The chief elements of the dust particles were C, O, Si, and Ca, and the major minerals were SiO2, AlSisOs, and CaCO3, indicating the possibility that the aeolian sand and dust came from the arid sand desert areas. Satellite image in the afternoon April 16 and 17 revealed large dust cloud appeared over eastern Alax and Ordos Plateau,Inner Mongolia.This dustfall leaded the PM1o(Particular matter less than 10 μm) increase fiercely and the atmosphere was highly polluted in Beijing.