Pollution Characteristics and Source of Carbon Components in Fine Particulate Matter in Urban and Suburban Areas of Nanjing
In order to compare the differences of characteristics and sources of carbon components aerosols in PM2 5 in Nanjing between urban and suburban areas,continuous monitoring of organic carbon(OC)and elemental carbon(EC)was conducted in the urban and suburban areas of Nanjing during year 2022 using carbon component online monitoring instruments.The results show that:(1)Concentrations of(OC)and(EC)in 2022 are(5.24±2.39)and(1.27±0.62)μg/m3 in urban areas,and(5.67± 2.45)and(1.32±0.70)μg/m3 in suburban areas.Concentrations of(OC)and(EC)in 2022 are both significantly lower than those in 2014-2018.Concentrations are high in winter and low in summer in both urban and suburban areas.From the perspective of daily variation characteristics,both OC and EC at the two stations are low at daytime and high at nighttime and exhibit obvious peak-valley values.(2)The correlation between OC and EC is high in winter,significantly higher than that in spring and summer.According to the relationship between carbon components and gaseous pollutants,as well as the ρ(OC)/ρ(EC)ratio analysis,there is secondary generation in both urban and suburban areas.Vehicles and coal are the main sources of pollutions in urban and suburban areas.The impact of vehicle sources on urban station is greater than that of suburban station,while the impact of coal sources on station is greater than that of urban station.(3)The direct emissions of pollution sources significantly affect the concentration level of OC in Nanjing,with the concentration of SOC in suburban areas being higher than that in urban areas.Urban areas should focus on motor vehicle emissions,while suburban areas need to collaborate with surrounding areas to control pollution from coal-fired and biomass combustion.
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