Particulate Matter Emitted By Vehicles in Freeway and Roadway Tunnel Environments:

(( SPEAKER ))DR. MICHAEL D. GELLER, Department of Civil and Environmental Engineering, USC(( ABSTRACT ))Individual organic compounds such as hopanes and steranes (originating in lube oil), selected polycyclic aromatic compounds (PAHs) (generated via combustion), and trace metals found in particulate emissions from vehicles have proven useful in source apportionment of ambient particulate matter.Currently, little ambient data exists for a majority of these species. Three sampling campaigns have been carried out in four different environments with similar ambient conditions: a gasoline only freeway, a heavy-duty diesel influenced freeway (~20% diesel), a gasoline only tunnel, and a mixed-vehicle (~4% diesel) tunnel.Trace organic species in the ultrafine (Very good agreement is observed between CA-110 (gasoline freeway) and light duty vehicle tunnel emission factors as well as I-710 (~20% diesel freeway) measurements and corresponding reconstructed emission factors from the tunnel for selected species. This study demonstrates the effective use of CO2-estimated dilution to associate assorted vehicle-emitted PM bound compounds in distinct vehicle-dominated environments.

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