An online monitoring system for atmospheric volatile organic compounds(VOCs)was used to monitor ambient air VOCs in Jiangmen City from June to October 2021,and analyze their concentration level,composition characteristics,daily variation characteristics,ozone generation potential,source analysis and pollution transport path.The results showed that the average volume fraction of TVOCs in Jiangmen City was 28.87 nmol/mol,and the volume fraction of TVOCs in autumn was significantly higher than that in summer,with alkanes>aromatics>alkenes and alkynes.The concentration of TVOCs was high in the morning and evening,showing diurnal variation of"W"distribution.The volume fraction of total ozone generating potential(OFP)was 133.22 nmol/mol.Aromatic hydrocarbons were the main active species,and the key active groups were M-p-xylene,toluene and o-xylene.According to the analysis of PMF model,VOCs mainly come from biomass combustion and industrial production sources,liquefied petroleum gas and gasoline volatile sources,and vehicle exhaust emission sources,followed by solvent and paint use sources and plant emission sources.
维普
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