초록 close

Concentrations of atmospheric e particles in Chungnam were measured at 7 sampling sites during 2005. Thedaily average concentrations of PM10, PM2.5, and PM1 ranged from 14.9 to 136.5 g/m3, 8.2 to 113.2g/m3, and5.7 to 107.5g/m3, respectively, and the highest levels were observed at Yeongi site. The lowest concentrations forthe all size fractions of particulate were observed at Taean located at the west end of the peninsula . The daily aver-age PM10 concentrations were below the current National Standard at all sites, while the daily average PM2.5 con-centrations frequently exceeded the US Standard at Cheonan, Dangjin, Boryeong, and Yeongi sites. The frequenciesof PM2.5 concentrations exceeding the US standard at Cheonan, Dangjin, Boryeong, and Yeongi were 10.8%,6.7%, 6.7%, and 26.7%, respectively. In addition, 68~ 80% of PM10 was in the PM2.5 fraction indicating that eparticles were the major component of atmospheric particles in Chunganm.