Comparison of the Chemical Characteristics and Source Apportionment of PM_1.0 and PM_2.5 Using Real-time Air Quality Monitoring Network Data of Air Pollutants

In this study, the mass concentration and chemical properties of PM_1.0 and PM_2.5 were compared and analyzed in Seoul and Baengnyeong during 2020~2022. The data reliability was evaluated by comparing real-time and filter-based mass concentration and chemical composition of PM_2.5. The correlation between the mass concentration of real-time and filter-based PM_2.5 was higher than 0.92 in both sites, and the seasonal trend of mass concentration was similar, which means that the two measurement methods are evaluated to be reliable. The PM_1.0/PM_2.5 ratio of mass concentration was high, accounting for about 80% in both Seoul and Baeungnyeong. The chemical composition and seasonal characteristics of PM_1.0 and PM_2.5 were similar, confirming that the contribution of PM_1.0 to PM_2.5 was high. The high concentration case studies and PMF model results show that the secondary pollutants were mainly distributed below PM_1.0 and highly affected the production of PM_2.5. This study is expected to provide information on evaluating the reliability of real-time measurement and filter-based data and on understanding the chemical composition and source characteristics of PM_1.0.