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- W152590683 abstract "Currently, Korea has a regulation only on PM10 concentration for atmospheric particles, and the 250 National Air Quality Monitoring Stations measure only PM10 mass concentrations. Thus, relatively little data are available on characteristics of atmospheric aerosols in Korea. Furthermore, National air quality standard for the daily average PM10 concentration has been strengthened to 100μg/m from 150μg/m in 2007. Therefore, areas unsatisfied the new standards are required to set up the effective air quality control strategy, and characterizations of atmospheric aerosols are necessary. Cheonan is located at 83.6km south from Seoul with approximately 500 thousand people. It is a centre of transportation for the national roads and railroads, and has been changing into industrial areas. The daily average PM10 concentrations in Cheonan often exceeded the new PM10 standards (Oh, 2006). Thus, the purpose of this study is to characterize atmospheric aerosols, and provide the data concerning size fractions, trends, and concentrations of aerosols in Cheonan, Korea. Size-differentiated mass concentrations of aerosols were determined using a high volume air sampler (Andersen, GV2360) equipped with a 5stage cascade impactor (Andersen, Model 235) at a site about 1,000m away from heavy traffic highway in Cheonan. Samples were taken for 24 hours of the total 22 times during January and December of 2006. In addition to these manual operations, real time concentrations of PM10 and PM2.5 were monitored at an interval of 1 minute with a laser sepectrometer (Grimm Model 1.107). Sampled aerosols showed mostly bimodal distributions with a saddle point in 1.5~3.0μm range in diameter and a larger peak in the fine mode, indicating urban characteristics (Willeke & Whitby, 1975). A MMD of fine mode particles were 056±0.17μm with a GSD of 2.65± 0.82, and those of coarse mode particles were 5.14±0.68μm and 2.15±0.28, respectively. Errors represent 95% confidence intervals. As listed in Table 1, mean values of the daily average concentrations of TSP, PM10, and PM2.5 were 57.0, 50.7, and 39.5μg/m, respectively. The highest daily average PM10 concentration exceeded the new national standard. Fractions of PM10 and PM2.5 in TSP were 88.9±1.8% and 69.3±3.9%, and the fraction of PM2.5 in PM10 was 77.9±2.2%. The results indicate that atmospheric aerosols in Cheonan were mainly fine mode particles." @default.
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- W152590683 date "2007-01-01" @default.
- W152590683 modified "2023-09-27" @default.
- W152590683 title "Characteristics of atmospheric aerosols in Cheonan, Korea during 2006" @default.
- W152590683 hasPublicationYear "2007" @default.
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