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For entries without a specified campus, we apportioned the remaining undetermined entries using a new apportionment method this year.
The MBO-derived organosulfate has the potential to serve as an SOA tracer for a source apportionment method under further investigation.
However, the magnitude of the background contribution agreed with those (50 65% at European urban background-sites) reported by Querol et al. (2004), who used a source apportionment method.
The larger estimated effect for Barcelona may be attributable to greater population density and subsequent exposure to traffic; differences in the mobile source mix, especially the high proportion of diesel vehicles; and/or the source apportionment method itself.
This result indicates that variations in choice of research group or source apportionment method have only a small effect on variations in the RR estimates, relative to the variations in RR caused by different source components.
Because these apportionment results were to be applied in time-series analyses, another evaluation of the consistency of the source apportionments across research groups and apportionment methods was conducted.
Source apportionment was not performed in this current analysis; however, a study of source apportionment methods found that correctly selected single-species tracers can be almost as informative in identifying source contributions as more rigorous methods (Sarnat et al. 2008).
Results showed that variability among the methods was small when compared with overall source-apportionment model uncertainty, and suggested that these apportionment methods may be useful in discerning source-specific health effects.
As a consequence, the U.S. Environmental Protection Agency sponsored a set of studies to evaluate alternative apportionment methods produced by various investigators.
The goal was to evaluate the consistency of the various source apportionment methods in assessing source contributions to daily PM2.5 mass mortality associations.
These results provide supportive evidence that existing PM2.5 source apportionment methods can be used to derive reliable insights into the source components that contribute to PM2.5 health effects.
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