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A photo-electric aerosol sensor, a diffusion charger, an Aethalometer, and acontinuous particle counter were used along with other real-time instrumentsto 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), where3 diesel trucks were tested. In Wilmington, the p-PAH, surface area,particle number, and "black" carbon concentrations were 4-8 times higherat 09:00–11:00 a.m. than between 17:00 and 18:00 p.m., suggesting that during rushhour traffic people living in that area are exposed to a higher number ofdiesel combustion particles enriched in p-PAH coatings. Dynamometer testsrevealed that the p-PAH emissions from the "baseline" truck (no catalyticconverter) were up to 200 times higher than those from the 2 vehiclesequipped with advanced emission control technologies, and increased when thetruck was accelerating. In Wilmington, integrated filter samples werecollected and analyzed to determine the concentrations of the most abundantp-PAHs. A correlation between the total p-PAH concentration (μg/m3) and the measured photo-electric aerosol sensor signal (fA) wasalso established. Estimated ambient p-PAH concentrations (Average=0.64 ng/m3; Standard deviation=0.46 ng/m3 were in good agreementwith those reported in previous studies conducted in Los Angeles during asimilar time period. Finally, we calculated the approximate theoreticallifetime (70 years per 24-h/day) lung-cancer risk in the Wilmington areadue to inhalation of multi-component p-PAHs and "black" carbon. Ourresults indicate that the lung-cancer risk is highest during rush hourtraffic and lowest in the afternoon, and that the genotoxic risk of theconsidered p-PAHs does not seem to contribute to a significant part of thetotal lung-cancer risk attributable to "black" carbon

Real-time characterization of particle-bound polycyclic aromatic hydrocarbons in ambient aerosols and from motor-vehicle exhaust