| From October 2019 to October 2020, PM2.5 sampling and analysis was carried out in Huaian, an eastern city in Jianghuai Plain, to study the composition and pollution characteristics of PM2.5. The results showed that the annual average mass concentration of PM2.5 in Huaian was (52.2±27.1)μg/m3, 1.5 times of the national secondary standard (35 μg/m3), and the highest concentration was (67.5±36.4)μg/m3 in winter, 1.9 times of the national secondary standard. In PM2.5, ρ(NO-3)/ρ(SO2-4)=1.76, indicating that motor vehicle exhaust emissions had a great impact on PM2.5 in Huaian. The average value of ρ(OC)/ρ(EC) was 4.1±1.1 in PM2.5, indicating that PM2.5 in Huaian was significantly affected by atmospheric secondary generation. The mass concentration of Si, Al, Ca and other inorganic elements was high, indicating that Huaian should strengthen the control of dust pollution. |
