Fine and coarse PM had been collected by LVCI (low volume cascade impactor) and HVAS (high volume air sampler) during January 1989 to April 2012 at Kyung Hee University, Global Campus located on the boarder of Yongin and Suwon. The database of PM mass concentration was constructed and then intensively and extensively investigated to understand monthly, seasonal, and annual patterns of each PM behavior. Especially the study separated all the PM data into the 5 Period Zones, which were classified

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... on the basis of social, political, and environmental issues that might be influencing local ambient air quality during the monitoring period. The overall PM 10 level had been continuously decreased until 2005 and after then was staggering due to rapidly increasing PM 2.5 level in PM 10 . The annual average of PM 2.5 concentration varied from 34.3 μg/m 3 to 59.0 μg/m 3 , which were much higher than the 2015 ambient air quality standard. The PM 2.5 level was strongly associated with haze events, while both PM 10 and PM 2.5 levels were associated with Yellow storm events. Daily concentrations of PM 2.5 were ranged 13.1~212.9 μg/m 3 in haze days and 33.6~124.6 μg/m 3 in Asian dust days. The study also intensively investigated annual and seasonal patterns of PM 2.5 /PM 10 ratios.