Estimation of Vehicular Suspended Particulates from Field Experimental Data near a Highway

概要

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Field experimental data for suspended particulates near a highway were analysed to estimate the emission by road traffic. In the experiment, suspended particulates (particulates smaller than 10μm), total suspended particulates, size distribution and nitrogen oxides concentrations were measured at four or five points near the road. The measuring points were located at 10, 50 and 100 meters from the road. The suspended particulates, total suspended particulates and size distribution were measured by piezo-electric or light scattering method, hi-volume air sampler and Andersen sampler, respectively. The nitrogen oxides concentrations were measured by chemical luminescence method. The hourly data showed high correlation between NOx and suspended particulates. From the proportionality of the two substances, emission coefficients including automotive and roadbed effects are figured out as follows: Ep, L=1.60 g/km/truck: for trucks and buses Ep, s=0.32 g/km/car: for passenger cars, mini-size cars and light rrucks The data of size distribution of suspended particulates showed also proportionality between NOx and coarse particulates greater than 2 μm. The estimated emission of TSP by vehicles are ETSP, L=2.08 g/km/truck: for trucks and buses ETSP, s 0.42 g/km/car: for passenger cars, mini-size cars and light trucks The piezo-electric data agreed very well with the hi-volume and also with the light scattering data.
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