Nutrient flux apportionment was also linked to inter-annual hydrological variability.
Results useful for source apportionment are also the elemental day/night ratios calculated to determine local contributions to PMx mass concentrations.
Newer, more sophisticated methods of source apportionment could also be used in the future.
Alternatively, sanitary surveys or fecal source apportionment can also provide an estimate of the contribution to fecal pollution by potential sources.
The PMF source apportionment model is also described in the Supplemental Material (doi 10.1289/ehp.1002638).
Other studies, using source apportionment techniques, have also reported associations with sulfate factors (e.g., Ito et al. 2006).
Source apportionment analyses are also planned, which will help elucidate the most germane sources and whether or not the current findings relate specifically to rural coarse PM, or more broadly to coarse PM derived from multiple different (e.g., urban) source types.
The genetic relationship indicated by structural and isotopic similarities between free and macromolecular aromatic units (Sephton et al., 1998) suggests that source apportionment for one fraction also applies to the other.
Put into historical perspective, every map on display communicates a sense not just of a piece of land but also of the apportionment of money and power in the world at a particular moment.
The corporate ethos in Japan, and especially at Nintendo, is self-effacing; the humility that has kept Miyamoto at the company for three decades, rather than in, say, Silicon Valley, seeking his billions, also governs the apportionment of credit.
