| Autor: |
Baalbaki, Rima1, Al-Assaad, Kassem1, Mehanna, Carl-Joe1, Saliba, Najat A.1 ns30@aub.edu.lb, Katurji, Marwan2, Roumié, Mohamad3 |
| Předmět: |
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| Zdroj: |
Journal of the Air & Waste Management Association (Taylor & Francis Ltd). Mar2013, Vol. 63 Issue 3, p327-335. 9p. |
| Abstrakt: |
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/cm3and 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. [ABSTRACT FROM AUTHOR] |
| Databáze: |
GreenFILE |
| Externí odkaz: |
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