Research progress in source and formation of organic aerosol
有机气溶胶的来源与形成研究现状

Research progress in source and formation of organic aerosol is presented from chemical compositions of organic aerosol, sources of primary aerosol and formation of the secondary organic aerosol. Primary aerosols are mainly emitted from cooking, vehicles, biomass burning, industry or civil organic emission of oil burning boiler, and also road dust, asphaltum, brake dust, wheel crumbs, outdoor cigarette smoke, altitude plant wax, bacteria activity and herbal plants. Semivolatile organic compounds (SVOCs) in the atmosphere can be transformed into secondary organic aerosols by physical and chemical adsorption. Some volatile organic compounds can be transformed into low volatile organic compounds by gaseous chemical reactions, and then formed secondary organic aerosols. The main precursors mentioned above are PAHs, as benzene, toluene, xylene, and alkenes, alkanes, naphthenes, terpenes and unsaturated oxides emitted by biomass.