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. In the present work, we conducted experiments of secondary organicaerosol (SOA) formation from urban cooking and vehicular sources tocharacterize the mass spectral features of primary organic aerosol (POA) andSOA using an high-resolution time-of-flight aerosol mass spectrometer(HR-ToF-AMS). Our results showed that the cooking styles have a greaterimpact on aged COA (cooking organic aerosol) mass spectra than oxidation conditions. However, theoxidation conditions affect the aged HOA (hydrocarbon-like OA) spectra more significantly than vehicle operating conditions. In our study, we use mass spectra similarity analysis and positive matrix factorization (PMF) analysis to establish the POA and SOA mass spectra of these two sources. These mass spectra are used as source constraints in a multilinear engine (ME-2) model to apportion the OA (organic aerosol) sources in the atmosphere. Compared with the traditional ambient PMF results, the improved ME-2 model can better quantify the contribution of POAand SOA from cooking and vehicular sources. Our work, for the first time,establishes the vehicle and cooking SOA source profiles, and can be furtherused in the OA source apportionment in the ambient atmosphere.

Mass spectral characterization of secondary organic aerosol from urban cooking and vehicular sources