title: Elucidating secondary organic aerosol from diesel and gasoline vehicles through detailed characterization of organic carbon emissions.
abstract: Emissions from gasoline and diesel vehicles are predominant anthropogenic sources of reactive gas-phase organic carbon and key precursors to secondary organic aerosol (SOA) in urban areas. Their relative importance for aerosol formation is a controversial issue with implications for air quality control policy and public health. We characterize the chemical composition, mass distribution, and organic aerosol formation potential of emissions from gasoline and diesel vehicles, and find diesel exhaust is seven times more efficient at forming aerosol than gasoline exhaust. However, both sources are important for air quality; depending on a region's fuel use, diesel is responsible for 65% to 90% of vehicular-derived SOA, with substantial contributions from aromatic and aliphatic hydrocarbons. Including these insights on source characterization and SOA formation will improve regional pollution control policies, fuel regulations, and methodologies for future measurement, laboratory, and modeling studies.
authors.affiliation: Department of Civil and Environmental Engineering, University of California, Berkeley, CA 94720, USA.
authors.forename: Drew R
authors.initials: DR
authors.lastname: Gentner
authors.forename: Gabriel
authors.initials: G
authors.lastname: Isaacman
authors.forename: David R
authors.initials: DR
authors.lastname: Worton
authors.forename: Arthur W H
authors.initials: AW
authors.lastname: Chan
authors.forename: Timothy R
authors.initials: TR
authors.lastname: Dallmann
authors.forename: Laura
authors.initials: L
authors.lastname: Davis
authors.forename: Shang
authors.initials: S
authors.lastname: Liu
authors.forename: Douglas A
authors.initials: DA
authors.lastname: Day
authors.forename: Lynn M
authors.initials: LM
authors.lastname: Russell
authors.forename: Kevin R
authors.initials: KR
authors.lastname: Wilson
authors.forename: Robin
authors.initials: R
authors.lastname: Weber
authors.forename: Abhinav
authors.initials: A
authors.lastname: Guha
authors.forename: Robert A
authors.initials: RA
authors.lastname: Harley
authors.forename: Allen H
authors.initials: AH
authors.lastname: Goldstein
mesh_terms: D000336:Aerosols / Q000032:analysis*; D002244:Carbon / Q000032:analysis*; D002248:Carbon Monoxide / Q000032:analysis; D008401:Gas Chromatography-Mass Spectrometry; D005742:Gasoline / Q000032:analysis*; D008970:Molecular Weight; D009930:Organic Chemicals / Q000032:analysis*; D001335:Vehicle Emissions / Q000032:analysis*; D055549:Volatile Organic Compounds / Q000032:analysis
chemical_list: D000336:Aerosols; D005742:Gasoline; D009930:Organic Chemicals; D001335:Vehicle Emissions; D055549:Volatile Organic Compounds; D002244:Carbon; D002248:Carbon Monoxide