title: Motor vehicle contributions to ambient PM10 and PM2.5 at selected urban areas in the USA.
abstract: A source apportionment study was carried out to estimate the contribution of motor vehicles to ambient particulate matter (PM) in selected urban areas in the USA. Measurements were performed at seven locations during the period September 7, 2000 through March 9, 2001. Measurements included integrated PM(2.5) and PM(10) concentrations and polycyclic aromatic hydrocarbons (PAHs). Ambient PM(2.5) and PM(10) were apportioned to their local sources using the chemical mass balance (CMB) receptor model and compared with results obtained using scanning electron microscopy (SEM). Results indicate that PM(2.5) components were mainly from combustion sources, including motor vehicles, and secondary species (nitrates and sulfates). PM(10) consisted mainly of geological material, in addition to emissions from combustion sources. The fractional contributions of motor vehicles to ambient PM were estimated to be in the range from 20 to 76% and from 35 to 92% for PM(2.5) and PM(10), respectively.
authors.affiliation: Department of Water Management and Environment, Heshemite University, P.O. Box 150459, Zarga 13115, Jordan.
authors.forename: Mahmoud
authors.initials: M
authors.lastname: Abu-Allaban
authors.forename: John A
authors.initials: JA
authors.lastname: Gillies
authors.forename: Alan W
authors.initials: AW
authors.lastname: Gertler
authors.forename: Russ
authors.initials: R
authors.lastname: Clayton
authors.forename: David
authors.initials: D
authors.lastname: Proffitt
mesh_terms: D000397:Air Pollution / Q000032:analysis*; D018986:Motor Vehicles; D010316:Particle Size; D052638:Particulate Matter / Q000032:analysis*; D011084:Polycyclic Aromatic Hydrocarbons / Q000032:analysis; D014481:United States; D001335:Vehicle Emissions / Q000032:analysis*
chemical_list: D052638:Particulate Matter; D011084:Polycyclic Aromatic Hydrocarbons; D001335:Vehicle Emissions