Particle and Aerosol Research Vol. 3, No. 1, March 2007 |
ISSN : 1738-8716 (Print) ISSN : 2287-8130 (Online) |
Ultrafine particle pollution level at the roadside of Seoul in spring
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Abstracts
Urban air is heavily polluted by vehicle exhaust in metropolitan area. Particularly, the ultrafine particle exposure
near the road is considered to have potential adverse health effect. In this study, the size distribution of particles
ranging from 14 to 615 nm in diameter was monitored in every 15 minutes by using a scanning mobility particle
sizer. The measurements were carried out on the side of the Sungsan Road in central Seoul from March 18 to 23,
2005. The number concentration of particles, particularly ultrafine particles, was highly fluctuated due to the traffic
situation. The lowest particle number concentration was observed at 3 to 5 a.m. The local highest particle number
concentrations were observed during the periods of both morning and evening rush hours. Change in traffic volume
accounted for the trend of hourly averaged number concentration from the late evening to the morning. When it
was raining, the particle concentration was significantly low, however it increased rapidly with increasing traffic
volume and finally reached the similar level that was observed in normal days. The smaller particles were observed
to be dominating in the morning rush hours, while the larger particles were monitored in the evening rush hours.
The relatively stable particle size distribution with a low concentration observed at 3 to 4 a.m. was suggested as a
background particle size distribution at the roadside in urban area.
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