Measurement of N02 and aerosol in the atmospheric pollution using differential optical absorption spectroscopy (DOAS) with an obstruction flashlight

摘要

[ABSTRACT] The Cheong-gye stream flowing from west to east in the city center of Seoul was functioned during about half a century as a busy highway after it had been covered with concrete in 1950’s. However, the problem of safetr by the aged deterioration was pointed out, and the conversion to the space of water and green was tried. The restored river was opened by the common people in October, 2005 after about two years of the restoration construction. During the execution of a large-scale city environmental improvement business that doesnu27t see the example in the world where an old river in the Seoul city is restored and a water and green space creates it，the purpose of this study is twofold. First, we compare the long-path result with the point data simultaneously measured at ground-based monitoring stations. Second, we analyze quantitative evaluation of the effect of Cheong-gye stream restoration on air quality. We report on the atmospheric pollution monitoring in Tokyo of Japan and Seoul of South Korea during the summer 2007. By means of the differential optical absorption spectroscopy(DOAS), average concentrations of N02 particles in the atmospheric pollution have been measured. The air quality standards of N02 around Cheong-gye stream was more than 50 ppb during 2001 to June 2005. However, it is worth observing atmospheric pollutant species, since the value of N02 around Cheong-gye stream has been low after restored a Cheong-gye stream.