Particle and Aerosol Research Vol. 8, No. 3, September 2012 |
ISSN : 1738-8716 (Print) ISSN : 2287-8130 (Online) |
Estimation of the Effect of Clean Road System on the PM10 Concentration at a Heavy Traffic Roadside - A Case study for Daegu City -
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Abstracts
In Daegu, a road cleaning system was constructed in the central part of the city and has been operated from April,
2011. We evaluated the effect of the system on the concentration of PM10 at a roadside monitoring site. The ambient
PM10 concentration data were logged every 1 min for a period of 20 weeks from May to October, 2011, by means
of light scattering method, and then every 5 min data were used in the statistical analysis. The measured data were
verified by comparing them with beta-ray data obtained at the same site. Correlation coefficient between the two
groups was highly significant (r=0.79), though the absolute levels of light scattering data appeared to be approximately
2.8 times higher than the beta-ray data. Diurnal, daily, weekly, and monthly variations of PM10 data did not show any
evidence of decreasing effect owing to the clean road system. A comparison of roadside PM10 data with non-roadside
data also revealed very similar pattern, implying the variation of the PM10 concentrations is mainly affected by the
traffic conditions near the monitoring site. However, if the operating conditions of the clean road system can be
improved, i.e. increasing the frequency and duration of water cleaning, the road cleaning effect may improve the air
quality indirectly by means of removing the resuspended particles from the road.
Keywords£ºPM10, Clean road system, Roadside, Light scattering, Beta-ray
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