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Proc Natl Acad Sci U S A

Title:		Elucidating secondary organic aerosol from diesel and gasoline vehicles through detailed characterization of organic carbon emissions
Author(s):		Gentner DR; Isaacman G; Worton DR; Chan AW; Dallmann TR; Davis L; Liu S; Day DA; Russell LM; Wilson KR; Weber R; Guha A; Harley RA; Goldstein AH;
Address:		"Department of Civil and Environmental Engineering, University of California, Berkeley, CA 94720, USA"
Journal Title:		Proc Natl Acad Sci U S A
Year:		2012
Volume:		20121022
Issue:		45
Page Number:		18318 - 18323
DOI:		10.1073/pnas.1212272109
ISSN/ISBN:		1091-6490 (Electronic) 0027-8424 (Print) 0027-8424 (Linking)
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"
Keywords:		Aerosols/*analysis Carbon/*analysis Carbon Monoxide/analysis Gas Chromatography-Mass Spectrometry Gasoline/*analysis Molecular Weight Organic Chemicals/*analysis Vehicle Emissions/*analysis Volatile Organic Compounds/analysis;
Notes:		"MedlineGentner, Drew R Isaacman, Gabriel Worton, David R Chan, Arthur W H Dallmann, Timothy R Davis, Laura Liu, Shang Day, Douglas A Russell, Lynn M Wilson, Kevin R Weber, Robin Guha, Abhinav Harley, Robert A Goldstein, Allen H eng Research Support, Non-U.S. Gov't Research Support, U.S. Gov't, Non-P.H.S. 2012/10/24 Proc Natl Acad Sci U S A. 2012 Nov 6; 109(45):18318-23. doi: 10.1073/pnas.1212272109. Epub 2012 Oct 22"