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Ambient and extracted masses of PM2.5 components. (A) Total mass of metals (μg) in ambient samples and corresponding extraction solutions at each sampling site. (B) Total mass of organics (ng) in ambient samples and corresponding extraction solutions at each sampling site. Site numbering is representative of total ambient PM2.5 mass ordering of low to high (1–5). Constituents comprising total metals and organics are shown in Table 2.
