Characterization of Submicron Number Concentration Particles at Bus Station and Scooter Parking Garage
Date Issued
2009
Date
2009
Author(s)
Shih, Jie-Ming
Abstract
The purpose of this study is to characterize NC11.1-1083.3, NC11.1-100（number concentration of particle with size 11.1 nm - 1083.3 and 11.1 nm - 100 nm）at bus station and scooter parking garage in Taipei and to understand the relation between particle number concentration and emission strength in two sampling sites.his submicron particle number concentration and size distribution was measured with a scanning mobility particle sizer（SMPS+C）and temperature and relative humidity were also measured at bus station and scooter parking garage in Taipei from February 20th to 22nd and October 28th to 30th, 2008 , respectively. The sampling period at each site is 72 hours. We also documented the traffic volume and used simple linear regression to understand the correlation between submicron particle number concentration and emission strength.verage NC11.1-1083.3 at bus station and scooter parking garage were 9.96×105 cm-3, 2.71×106 cm-3 respectively, and are about 90％ of particle number under 100 nm. There were significant diurnal variation in concentrations and traffic volume at bus station and scooter parking garage. There were positive correlations between NC11.1-1083.3, NC11.1-100 and traffic volume. The R-square for NC11.1-1083.3 and NC11.1-100 were 0.523 and 0.533 at bus station and 0.802 and 0.767 at scooter parking garage. There were also positive correlation between traffic volume and particle size under 271.8 nm at bus station and 11.1 nm -27 nm and 27 nm – 124.1 nm at scooter parking garage.he number concentration in rush hour was 27 times higher than in none rush hour at bus station and peak hour was 11 times higher then none peak hour at scooter parking garage. Both diesel and gasoline powered vehicle were highly correlation with particle under submicrometer at bus station and scooter parking garage. The correlation between particle number concentration between traffic volume in semi-open space was higher than in open space.
Subjects
submicron
ultrafine
traffic volume
Type
thesis
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