Abstract
The variation of the particle size distribution and density as well as the chemical composition of aerosols is important to evaluate the particles. This study measured and analyzed airborne particles using a scanning mobility particle sizer (SMPS) system and an aerodynamic particle sizer (APS) at the University of Seoul during every season. The highest particle number concentration of airborne particles less than <TEX>$0.9\;{\mu}m$</TEX>, occurred in winter, while the highest particle number concentration of airborne particles more than <TEX>$0.9\;{\mu}m$</TEX>, occurred in spring. Mass concentration appeared highest at spring. Also, when we compared <TEX>$\beta$</TEX>-ray's mass concentration with calculated mass concentration by using the SMPS-APS system during each season, density of the winter is <TEX>$1.92\;g/cm^3$</TEX>, spring density is <TEX>$1.64\;g/cm^3$</TEX>, fall density is <TEX>$1.57\;g/cm^3$</TEX>. We found out that PM10 density was differ every season. However, while the calculated density is whole density for PM10 the density of each diameter was different. In this study the density estimation equation of the QCM cascade impactor measured mass concentration of each diameter.
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