Based on the PM₁₀ mean concentration data and surfacemeteorological data during Jan.-Dec.,2002,dalily PM₁₀ variation characters of Rizhao city and their relations with surface wind speed,wind direction are analyzed.Results show that the lightmedium and heavy pollution days(API>100)all occurred in January to April;the PM₁₀ concentration was to some extent correlated with surface wind speed,i.e.when the surface wind speed was greater than 5m/s,the pollution(API>100)was rarely seen,and the pollutions concentration showed a reducing trend when the surface wind speed exceeded(6.5m/s;)and the pollutions concentration exhibited an obvious seasonal variation,and the concentrations in winter and spring were remarkably higher than those in summer and autumn.