Abstract: Effects of two dust storms respectively in March 15～19 and March 21～23 on atmospheric aerosol concentrations are analyzed based on TSP,PM₁₀ and size segregated aerosol concentrations obtained in the spring of 2002 in Qingdao.During the two dust storms,TSP mass concentration in Qingdao was 0.488 mg/m\+3 and 0.721 mg/m\+3,being 2.8 and 4.1 times more than normal weather.The 2～7 μm aerosols are main dust aerosol coming to Qingdao from northern dust source region.During the second dust storm,mass concentrations of particulates in the size range of 2～7 μm increased to 30 times,with mass concentration of 2.1～3.3 μm particulates as high as 0.13 mg/m\+3.Continuous observation of PM₁₀ concentration and the surface meteorology data show that dust was transported to Qingdao city by upper air before the surface wind turned to north.