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KMID : 1024520020110121253
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Journal of the Environmental Sciences
2002 Volume.11 No. 12 p.1253 ~ p.1259
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Characteristics of Diurnal Variation of the Atmospheric Pollutants Concentration in High-Ozone Episode day in Daegu
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Son Im-Young
Yoon Ill-Hee
Kim Hee-Jong
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Abstract
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This study analyzes the surface ozone, NO and concentration data from 1997 to 1999 in Daegu. It investigates effect on precursor during high-ozone episode days. The high-ozone episode is defined when a daily maximum ozone concentration is higher than 100 ppb(ambient air quality standard of Korea) in at least one station among six air quality monitoring stations. The frequency of episodes is 13 days(33 hours). The frequency is the highest in May and September, and the area with the highest frequency is Nowondong and Manchondong. The average value of daily maximum ozone concentration with high ozone episode is 81.6 ppb, and that of 8-hour average ozone concentration is 58.6 ppb. It means that ozone pollution is continuous and wide-ranging in Daegu. The daily variation of NO, and in high-ozone episodes are inversely proportional one another. Nowondong an industrial area, is affected by pollutants that are emitted from the primary sources, while Manchondong a residential area, is affected by the advection of or by the primary pollutants like VOCs.
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KEYWORD
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Atmospheric pollutants concentration, Surface ozone, High-ozone episode day
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