Road versus roadside particle size distribution in a hot Mediterranean summer-Estimation of fleet emission factors

Particle size distribution at major on-road, roadside, and university-ground sites in Lebanon were studied in summer 2011. In a predominant old traffic fleet, it is shown that calculated PM2.5 mass emission factors (EFs) conform to those of heavy duty vehicles. When compared to roads in California,...

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Bibliographic Details
Published in:Journal of the Air & Waste Management Association (1995) 2013-03, Vol.63 (3), p.327-335
Main Authors: Baalbaki, Rima, Al-Assaad, Kassem, Mehanna, Carl-Joe, Saliba, Najat A., Katurji, Marwan, Roumié, Mohamad
Format: Article
Language:English
Subjects:
Airborne particulates
Applied sciences
Atmospheric pollution
Boundary layer
Cities
Counting
Dispersions
Emission
Emissions control
Exact sciences and technology
Hot Temperature
Mediterranean Region
Meteorology
Particle Size
Particle size distribution
Particulate Matter - analysis
Pollutants physicochemistry study: properties, effects, reactions, transport and distribution
Pollution
Pollution sources. Measurement results
Roads
Roadsides
Summer
Transportation
Transports
Vehicle Emissions - analysis
Waste management
Weather
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Summary:Particle size distribution at major on-road, roadside, and university-ground sites in Lebanon were studied in summer 2011. In a predominant old traffic fleet, it is shown that calculated PM2.5 mass emission factors (EFs) conform to those of heavy duty vehicles. When compared to roads in California, higher PM2.5 mass but similar particle number EFs are obtained for the average fleet of the on-road sites. This confirms the observed particle size distribution pattern, rich in particles in the accumulation range mainly between 0.425 and 0.675 µm with a prevalent peak at 0.475 µm. Corresponding total particle counts (TC) measured on the roadside are as high as 14,050 particles/cm 3 and are up to 67% higher than particle counts measured at the university-ground site. In a hot, dry and humid summer weather with consistent temperature oscillations, particle dispersion is shown to be a function of meteorological factors, mainly the effect of the boundary-layer thickness, with particle counts measured during the morning being around 40% higher than particle counts measured during the afternoon.
ISSN:1096-2247
2162-2906
DOI:10.1080/10962247.2012.761660