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임봉빈(Bongbeen Yim),김선태(Sun-Tae Kim),양흥모(Heung-Mo Yang) 한국대기환경학회 2008 한국대기환경학회지 Vol.24 No.2
This study investigates the variation and spatial distribution of nitrogen dioxide (NO₂) concentrations measured with passive diffusive samplers at 40 curbside points in Daejeon. Average NO₂ concentration was 39.8±18.0 ppb (n=1,127) and the significant difference in concentrations by regional groups (Dong-gu, Jung-gu, Seo-gu, Daedeok-gu, Yuseong-gu) was not observed. The frequency distribution of NO₂ concentration was found to be a normal distribution with the high frequency in the concentration range of 30 to 40 ppb (20 to 25%). Average NO₂ concentration measured during the rainy periods was lower than that measured during the non-rainy periods and the decrease of concentration by rainfall was about 16% (7 ppb). The variation of NO₂ concentrations measured by passive diffusive samplers during the sampling period was similar to that continuously measured at the air quality monitoring station.