title: Gas-Particle Partitioning of Vehicle Emitted Primary Organic Aerosol Measured in a Traffic Tunnel.
abstract: We measured the gas-particle partitioning of vehicle emitted primary organic aerosol (POA) in a traffic tunnel with three independent methods: artifact corrected bare-quartz filters, thermodenuder (TD) measurements, and thermal-desorption gas-chromatography mass-spectrometry (TD-GC-MS). Results from all methods consistently show that vehicle emitted POA measured in the traffic tunnel is semivolatile under a wide range of fleet compositions and ambient conditions. We compared the gas-particle partitioning of POA measured in both tunnel and dynamometer studies and found that volatility distributions measured in the traffic tunnel are similar to volatility distributions measured in the dynamometer studies, and predict similar gas-particle partitioning in the TD. These results suggest that the POA volatility distribution measured in the dynamometer studies can be applied to describe gas-particle partitioning of ambient POA emissions. The POA volatility distribution measured in the tunnel does not have significant diurnal or seasonal variations, which indicate that a single volatility distribution is adequate to describe the gas-particle partitioning of vehicle emitted POA in the urban environment.
authors.affiliation: Center for Atmospheric Particle Studies, Carnegie Mellon University , Pittsburgh, Pennsylvania 15213, United States.|Department of Mechanical Engineering, Carnegie Mellon University , Pittsburgh, Pennsylvania 15213, United States.
authors.forename: Xiang
authors.initials: X
authors.lastname: Li
authors.affiliation: Center for Atmospheric Particle Studies, Carnegie Mellon University , Pittsburgh, Pennsylvania 15213, United States.|Department of Mechanical Engineering, Carnegie Mellon University , Pittsburgh, Pennsylvania 15213, United States.
authors.forename: Timothy R
authors.initials: TR
authors.lastname: Dallmann
authors.affiliation: Center for Atmospheric Particle Studies, Carnegie Mellon University , Pittsburgh, Pennsylvania 15213, United States.|Department of Mechanical Engineering, Carnegie Mellon University , Pittsburgh, Pennsylvania 15213, United States.
authors.forename: Andrew A
authors.initials: AA
authors.lastname: May
authors.affiliation: Center for Atmospheric Particle Studies, Carnegie Mellon University , Pittsburgh, Pennsylvania 15213, United States.|Department of Civil and Environmental Engineering, Carnegie Mellon University , Pittsburgh, Pennsylvania 15213, United States.
authors.forename: Daniel S
authors.initials: DS
authors.lastname: Tkacik
authors.affiliation: Aerodyne Research, Inc., Billerica, Massachusetts 01821, United States.
authors.forename: Andrew T
authors.initials: AT
authors.lastname: Lambe
authors.affiliation: Aerodyne Research, Inc., Billerica, Massachusetts 01821, United States.
authors.forename: John T
authors.initials: JT
authors.lastname: Jayne
authors.affiliation: Aerodyne Research, Inc., Billerica, Massachusetts 01821, United States.
authors.forename: Philip L
authors.initials: PL
authors.lastname: Croteau
authors.affiliation: Center for Atmospheric Particle Studies, Carnegie Mellon University , Pittsburgh, Pennsylvania 15213, United States.|Department of Mechanical Engineering, Carnegie Mellon University , Pittsburgh, Pennsylvania 15213, United States.
authors.forename: Albert A
authors.initials: AA
authors.lastname: Presto
mesh_terms: D000336:Aerosols; D000393:Air Pollutants; D008401:Gas Chromatography-Mass Spectrometry; D010316:Particle Size; D001335:Vehicle Emissions; D014835:Volatilization
chemical_list: D000336:Aerosols; D000393:Air Pollutants; D001335:Vehicle Emissions