Supplementary material to "Multiple pathways for the formation of secondary organic aerosol in North China Plain in summer"

Abstract

Table S2. Concentrations of the main chemical components in PM1/PM2.5 during summer and winter 24 observations in NCP in recent years. 25 26 Sites OA SO4 NO3 NH4 Cl BC PM PM1 NR-PM1 PM2.5 3 44 Table S3. Elemental ratios and OM:OC ratios in OA obtained from field observations at urban and 45 rural/suburban sites. The ratios are corrected by the "improved-ambient" method (Canagaratna et al., 46 2015).