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(a) Average total mass concentration and composition of PM1; (b) average mass concentrations of oxygenated OA factors (including OOAtotal, LV-OOA, and SV-OOA); and (c) average mass concentrations of primary OA factors (including HOA, BBOA, and COA) in PM1 at individual sites in northern hemisphere (Plotted using data from Zhang et al. [6], Jimenez et al. [13], and Ng et al. [14])
