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Apportionment of Primary and Secondary Organic Aerosols in Southern California...

Docherty, K. S., E. A. Stone, I. Ulbrich, D. C. Snyder, J. J. Schauer, R. E. Peltier, R. Weber, S. M. Murphy, J. H. Seinfeld, B. D. Grover, D. J. Eatough, and J. Jimenez-Palacios (2008), Apportionment of Primary and Secondary Organic Aerosols in Southern California during the 2005 Study of Organic Aerosols in Riverside (SOAR-1), Environ. Sci. Technol., 42, 7655-7662, doi:10.1021/es8008166.

the single largest component of PM1 aerosol in Riverside. Average SOA/OA contributions of 70-90% were observed during midday periods, whereas minimum SOA contributions of ∼45% were observed during peak morning traffic periods. These results are contrary to previous estimates of SOA throughout the Los Angeles Basin which reported that, other than during severe photochemical smog episodes, SOA was lower than primary OA. Possible reasons for these differences are discussed.

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Tropospheric Composition Program (TCP)