Air pollution has been raised as a serious problem in the Seoul Metropolitan Area(SMA) as it is overcrowded and many pollution sources are widely scattered in and around the area. More importantly, much attention has been paid to PM-10, one of the fine particles regulated by national standards, because it has significant influence on human health, directly or indirectly, and causes inconveniences in our daily life. This study used mass concentration data of PM-10 in the SMA for the last decade (2000~ 2010) to find out the concentration trend. The study also qualified and quantified changes in mass concentration of PM10 based-on factors which affect mass concentrations such as meteorological factors, long-ranged air pollutants like yellow dust, existing air quality polities and the impact of changing mass concentrations of PM-10 by emissions.