Atmospheric Chemistry and Physics www.atmos-chem-phys.net 1680-7316 1680-7324 8 5 2008 10.5194/acp-8-1277-2008 http://www.atmos-chem-phys.net/8/1277/2008/ http://www.atmos-chem-phys.net/8/1277/2008/acp-8-1277-2008.html http://www.atmos-chem-phys.net/8/1277/2008/acp-8-1277-2008.pdf 1277 1291 2008-03-04 Real-time characterization of particle-bound polycyclic aromatic hydrocarbons in ambient aerosols and from motor-vehicle exhaust A. Polidori S. Hu S. Biswas R. J. Delfino C. Sioutas Department of Civil and Environmental Engineering, University of Southern California, 3620 South Vermont Ave., Los Angeles, CA, 90089, USA Epidemiology Division, Department of Medicine, University of California Irvine, 100 Theory Dr., Suite 100, Irvine, CA 92617, USA A photo-electric aerosol sensor, a diffusion charger, an Aethalometer, and a continuous particle counter were used along with other real-time instruments to characterize the particle-bound polycyclic aromatic hydrocarbon (p-PAH) content, and the physical/chemical characteristics of aerosols collected a) in Wilmington (CA) near the Los Angeles port and close to 2 major freeways, and b) at a dynamometer testing facility in downtown Los Angeles (CA), where 3 diesel trucks were tested. In Wilmington, the p-PAH, surface area, particle number, and "black" carbon concentrations were 4-8 times higher at 09:00–11:00 a.m. than between 17:00 and 18:00 p.m., suggesting that during rush hour traffic people living in that area are exposed to a higher number of diesel combustion particles enriched in p-PAH coatings. Dynamometer tests revealed that the p-PAH emissions from the "baseline" truck (no catalytic converter) were up to 200 times higher than those from the 2 vehicles equipped with advanced emission control technologies, and increased when the truck was accelerating. In Wilmington, integrated filter samples were collected and analyzed to determine the concentrations of the most abundant p-PAHs. A correlation between the total p-PAH concentration (μg/m³) and the measured photo-electric aerosol sensor signal (fA) was also established. 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