Abstract
The purpose of this study was to analyze the meteorological characteristics of wintertime high PM10 concentration episodes in Busan. <TEX>$PM_{10}$</TEX> concentration has been reduced for the past four years and recorded near or exceeded 100 <TEX>${\mu}g/m^3$</TEX> (national standard of <TEX>$PM_{10}$</TEX>). High concentration episodes in Busan were 6 case, <TEX>$PM_{2.5}/PM_{10}$</TEX> ratio was 0.36~0.39(mean 0.55). High <TEX>$PM_{10}$</TEX> concentration occurred during higher air temperature, more solar radiation and sunshine, lower relative humidity, and smaller cloud amount. Synoptically, it also occurred when Busan was in the center or the edge of anticyclone and when sea breeze intruded. An analysis of upper air sounding showed that high <TEX>$PM_{10}$</TEX> concentration occurred when surface inversion layer and upper subsidence inversion layer existed, and when boundary layer depth and vertical mixing coefficient were low. An analysis of backward trajectory of air mass showed that high <TEX>$PM_{10}$</TEX> concentration was largely affected by long range transport considering that it occurs when air mass is intruded from China.
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