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Contribution to total PM2.5 mass. Percent contribution to PM2.5 mass for total metals and organics (sum of constituents listed in Table 2) in ambient samples and extraction solutions. Left y-axis represents percent contribution of metals and the right y-axis indicates organics contribution. Data are expressed as means±SD; *p value <0.05 and **p value<0.001, indicating a statistically significant difference between ambient and extracted samples.
