Particle and Aerosol Research Vol. 7, No. 1, March 2011 |
ISSN : 1738-8716 (Print) ISSN : 2287-8130 (Online) |
Characteristics of spatial distribution of ultrafine particle number concentration on the roads of Nowon-gu, Seoul
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Abstracts
The spatial distributions of air pollutants, in particular, ultrafine particles near traffic congestion roads at urban areas need to reduce human exposure levels for protecting public health. In this study, the number concentrations of
ultrafine particles larger than 5 nm were measured every second during driving on the major roads of Nowon-gu,
Seoul for 1.6 h using a mobile emission laboratory on October 5, 2010. The ultrafine particle number concentrations
ranged from 7,009 to 265,600 particles/§¨ with an average of 55,570 particles/§¨, and these levels were comparable
to concentrations of ultrafine particles larger than 3 or 7 nm on the arterial roads at urban areas in Los Angeles, USA
and Zürich, Switzerland. It was frequently observed that the ultrafine particle number increased rapidly when vehicle
speed was accelerated and it decreased sharply when vehicle speed was decelerated. The high peak events of ultrafine
particle concentration larger than 200,000 particles/§¨ were observed seven times during the measurement period. From
the three repeated measurements during the short period of 50 min, it was concluded that the ultrafine particle number
concentration on the road was significantly time-dependent. This on-road measurement approach can be utilized to
manage vehicle-related air pollution in urban.
Keywords£ºUltrafine particle, Spatial distribution, Mobile Emission Laboratory, On-road measurement
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