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. Author manuscript; available in PMC: 2020 Oct 1.
Published in final edited form as: Environ Int. 2019 Jul 8;131:104968. doi: 10.1016/j.envint.2019.104968

Figure 2.

Figure 2

Source profiles contributing to outdoor PM2.5. The grey filled-in rectangle represents the estimated average concentration of each species by source factor estimated using PMF. The small closed (red) square represents the percentage of a specific species ascribed to the specific source (factor) by PMF. For example, using PMF, the mean concentration of indoor SO4 ascribed to secondary pollution is 1.3 μg/m3, which is 80% of the total sulfate concentration (See also Table 4). The small open square represents the estimated average concentration of each species by source factor estimated using DISP with the error bars indicating the confidence intervals.