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. 2017 Feb 7;34(1):6–14. doi: 10.5114/ada.2017.65616

Table 2.

The five major soluble and insoluble components of PM2.5 [34–36]

Soluble components Insoluble components
Sulfate (SO42–) Organic carbon (OC)
Nitrate (NO3–)
Ammonium (NH4+) Elemental carbon (EC)