Anthropogenic Oxygenated Organic Molecules Dominate New Particle Growth in Moderate-Pollution Urban China

The Supporting Information is available free of charge at https://pubs.acs.org/doi/10.1021/acs.est.5c11555 . Detailed information about the study site representativeness and air quality profile (Text S1, Figure S1), instrumental measurements (Text S2), calculation of condensation sink, nucleation, and growth rates (Text S3), mass spectrometer data analysis for H 2 SO 4 and OOMs quantification (Text S4), workflow and uncertainty analysis for OOMs classification (Text S5, Figure S14), estimation of OOMs volatility (Text S6), and simulation of particle growth rates (Text S7). Study site location (Figure S2), NPF event frequency (Figure S3), comparative analysis of atmospheric parameters on NPF vs non-NPF days (Figure S4) and NPF-G vs NPF-NG days (Figure S7), DMA variability and its association with SA dimer (Figure S5), contextualization of H 2 SO 4 and DMA levels with other Chinese megacities (Figure S6), relation between simulated and observed growth rates (Figure S8), temporal evolution of particle growth (Figure S9), overall volatility distribution of OOMs (Figure S10), volatility-class contributions to size-resolved growth (Figure S11), aromatic dominance in low-volatility OOM speciation (Figure S12), and proposed formation mechanisms for dominant aromatic OOMs (Figure S13). Top ten species contributing to new particle growth in the 1–3 nm, 3–7 nm, and 7–15 nm size ranges (Tables S1–S3), intercomparison of OOMs and pollutant concentrations across Chinese urban sites (Table S4), and median concentrations of measured volatile organic compounds (VOCs) (Table S5) ( PDF )