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Source Reconciliation of Atmospheric Gas-Phase and Particle-Phase Pollutants during a Severe Photochemical Smog Episode

Schauer, James J. and Fraser, Matthew P. and Cass, Glen R. and Simoneit, Bernd R. T. (2002) Source Reconciliation of Atmospheric Gas-Phase and Particle-Phase Pollutants during a Severe Photochemical Smog Episode. Environmental Science and Technology, 36 (17). pp. 3806-3814. ISSN 0013-936X. doi:10.1021/es011458j.

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A comprehensive organic compound-based receptor model is developed that can simultaneously apportion the source contributions to atmospheric gas-phase organic compounds, semivolatile organic compounds, fine particle organic compounds, and fine particle mass. The model is applied to ambient data collected at four sites in the south coast region of California during a severe summertime photochemical smog episode, where the model determines the direct primary contributions to atmospheric pollutants from 11 distinct air pollution source types. The 11 sources included in the model are gasoline-powered motor vehicle exhaust, diesel engine exhaust, whole gasoline vapors, gasoline headspace vapors, organic solvent vapors, whole diesel fuel, paved road dust, tire wear debris, meat cooking exhaust, natural gas leakage, and vegetative detritus. Gasoline engine exhaust plus whole gasoline vapors are the predominant sources of volatile organic gases, while gasoline and diesel engine exhaust plus diesel fuel vapors dominate the emissions of semivolatile organic compounds from these sources during the episode studied at all four air monitoring sites. The atmospheric fine particle organic compound mass was composed of noticeable contributions from gasoline-powered motor vehicle exhaust, diesel engine exhaust, meat cooking, and paved road dust with smaller but quantifiable contributions from vegetative detritus and tire wear debris. In addition, secondary organic aerosol, which is formed from the low-vapor pressure products of gas-phase chemical reactions, is found to be a major source of fine particle organic compound mass under the severe photochemical smog conditions studied here. The concentrations of secondary organic aerosol calculated in the present study are compared with previous fine particle source apportionment results for less intense photochemical smog conditions. It is shown that estimated secondary organic aerosol concentrations correlate fairly well with the concentrations of 1,2-benzenedicarboxylic acid in the atmospheric fine particle mass, indicating that aromatic diacids may be useful in the quantification of certain sources of secondary organic aerosol in the atmosphere.

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Additional Information:© 2002 American Chemical Society. Received for review December 5, 2001. Revised manuscript received June 4, 2002. Accepted June 13, 2002. We thank Anne Miguel for providing us with samples of paved road dust samples collected in the South Coast Region of California and Dr. Kent Hoekman at Chevron for analyzing the composite gasoline sample. This research was supported by the California Air Resources Board under Agreement A93-329.
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California Air Resources BoardA93-329
Issue or Number:17
Record Number:CaltechAUTHORS:20160607-125105203
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Official Citation:Source Reconciliation of Atmospheric Gas-Phase and Particle-Phase Pollutants during a Severe Photochemical Smog Episode James J. Schauer, Matthew P. Fraser, Glen R. Cass, and Bernd R. T. Simoneit Environmental Science & Technology 2002 36 (17), 3806-3814 DOI: 10.1021/es011458j
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:67737
Deposited By: George Porter
Deposited On:07 Jun 2016 22:57
Last Modified:11 Nov 2021 03:53

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