Influence of Inorganic Gases on Formation and Chemical Composition of Monoaromatic Hydrocarbons Secondary Organic Aerosol
Abstract SO2, NOx and NH3 are common low molecular weight inorganic gases in the atmosphere that can affect the formation and chemical composition of secondary organic aerosols (SOA) through photochemical reaction processes. SOA formed from photooxidation of volatile organic compounds (VOCs) released by motor vehicle exhaust, such as monoaromatic hydrocarbons, are an important component of urban fine particulate matter, which has a significant impact on climate change, human health and atmospheric visibility. However, previous studies focused on photooxidation of biogenic volatile organic compounds, and relatively few on the reaction of anthropogenic monoaromatic hydrocarbons with high content in the atmosphere with inorganic gases such as SO2, NOx and NH3. In this paper, the photochemical mechanism and five kinds of common chemical composition of the laboratory simulation of SOA formation from OH• radical initiating oxidation of monoaromatic hydrocarbons were summarized, and the effects of SO2, NOx and NH3 on the formation and chemical composition of monoaromatic hydrocarbons SOA by homogeneous and heterogeneous chemical reactions were also discussed. It is helpful to deeply understand the formation mechanism and chemical composition of SOA and atmospheric brown carbon under the conditions of complex atmospheric pollution, and has certain reference significance for the prevention, control and treatment of air pollution in China at present.