Analysis of carbonaceous material in southern California atmospheric aerosols. 2

Apportionment of Primary and Secondary Organic Aerosols in Southern California during the 2005 Study of Organic Aerosols in Riverside (SOAR-1)

“…Numerous studies have previously estimated the SOA in the LA Basin using a variety of methods including modeling (47-51), CMB-MM (2,52), and the EC-tracer method (20,21,53). Figure 2 presents several previous estimates of SOA/OA in this region along with the five estimates from this study.…”

An Overview of the Rio de Janeiro Aerosol Characterization Study

“…" 31 The small percentage of ACE in the EOM from Rio de Janeiro suggests that there was relatively little secondary organic aerosol generated during the wintertime period of this study. Previous work by Daisey and coworkers 26 indicates that both the ambient concentrations and the percentage of ACE in the aerosol increase during photochemical pollution episodes.…”

“…Hering et al 28 have found that the ratios of the benzofluoranthenes to CO in the Caldecott Tunnel are higher when there is a greater percentage of diesel traffic. Miguel et al 31 also observed a linear increase in benzofluoranthenes with increasing percentages of diesel vehicles in the Santa Barbara Tunnel in Rio.…”

Reduction of the Positive Organic Artifact on Quartz Filters

“…Filtration studies designed to better quantify the artifacts have been reported, but they have been inconclusive because the filtration artifacts compete. These studies have included varying the sampling interval (Appel et al, 1979) or face velocity (Appel et al, 1983) using an impactor-filter combination (McMurry et al, 1986) and using a dual filter pack (Cadle et al, 1983). The latter two studies are of some interest here.…”