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, direction (WD) (b) relative humidity (RH) and ambient temperature (T); (c) O x (= O 3 + NO 2 ), NO 2 , and SO 2 ; and (d) mass concentrations of IEPOX-SOA, sulfate (SO 4 ), isoprene, and methyl vinyl ketone and methacrolein (MVK+MACR). The air masses during the study period were also classified into four clusters as shown in Figure S2. The missing data of isoprene and MVK+MACR on the Fig, Figure 1. Time series of