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 Figure 3. Results for six sets of air samples collected in two outdoor locations. OC and EC results are the means for the top quartz filters (QQ1) of quartz-filter pairs. TQQ1 is the mean carbon (total) result for quartz filters placed directly beneath Teflon. BQ is the mean carbon result for all bottom quartz filters (i.e., QQ2 and TQQ2). See text for additional details.

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NIOSH Manuual of Analytical Methods