Chemical Composition Analysis of PM2.5/PM10 Emissions from Automobile Exhaust
The formation of haze and its impact on human health have become a focus of environmental research worldwide.Among them,the small particulate matter(such as PM2.5 and PM10)emitted from traffic exhaust is a key research area.In response to this issue,the experiment chose Nanjing as the case study location to analyze the chemical composition of inhalable particulate matter in automobile exhaust emissions during a severe air pollution incident.It was found that gasoline vehicles emitted fewer carbon components in particulate matter,and the ratio of organic carbon(OC)to elemental carbon(EC)was much higher than that of diesel vehicles.In terms of water-soluble ions,sodium ions,nitrate ions,and sulfate ions dominate the particulate matter emissions of all vehicle models.These differences are mainly related to the emission of nitrogen oxides(NOx)during high-temperature combustion and the formation of sulfates in exhaust gases.In terms of metal element content,it can also be observed that the metal content in the emissions of gasoline vehicles is generally higher than that of diesel vehicles,which may be related to the quality of the vehicles.In summary,the exhaust emissions of motor vehicles are undoubtedly one of the important factors contributing to urban air pollution.Reducing secondary organic carbon and decreasing the use of metal components can be strategies to reduce urban air pollution.
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