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<p>Regional atmospheric pollution events still occur frequently in China despite the decline in PM<sub>2.5</sub> concentrations in recent years. In order to investigate the chemical composition and pollution characteristics of atmospheric fine particulate matters measured by off-line soot particle aerosol mass spectrometer in Nanjing during the cold seasons, this study presented a comprehensive analysis of PM<sub>2.5</sub> diurnal samples from October 10 to December 31 in the year 2020, which collected at a typical suburban site in Nanjing. Results showed that water-soluble inorganic ions dominated PM<sub>2.5</sub> mass, with NH<sub>4</sub><sup>+</sup> primarily forming NH<sub>4</sub>NO<sub>3</sub>, (NH<sub>4</sub>)<sub>2</sub>SO<sub>4</sub> and NH<sub>4</sub>Cl through secondary reactions. Excess NO<sub>3</sub><sup>-</sup> was found in the form of Ca(NO<sub>3</sub>)<sub>2</sub> and Mg(NO<sub>3</sub>)<sub>2</sub>. Emissions from vehicle exhaust significantly contributed to the inorganic component, and both organic and inorganic analyses indicated that biomass burning was a more significant primary source during the night. In terms of water-soluble organic components (WSOM), the average O/C, H/C, N/C, and organic matter to organic carbon ratio (OM/OC) were 0.48, 1.38, 0.03, and 1.79, respectively. Four OA factors were identified in WSOM: hydrocarbon-related OA from traffic emissions (HOA), mixed primary OA (MPOA), low oxidized OA (LO-OOA), and more oxidized OA (MO-OOA). Their daytime contributions were 10.6%, 25.6%, 35.5%, and 28.8%, while nighttime contributions were 9.7%, 33.5%, 32.9%, and 23.9%, respectively. Potential source contribution function (PSCF) analysis showed that Yangtze River Delta, North China, and Mongolia were major potential sources of PM<sub>2.5</sub>, highlighting the importance of coordinated measures to reduce PM<sub>2.5</sub> in Nanjing.</p>

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Chemical characteristics and source apportionment of fine particulate matters at a typical suburban site in Nanjing, China

  • 期刊论文

  • 发表日期：

    2025年4月25日

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  • Ziqian Wei,
  • Ruoyuan Lei,
  • Meijuan Chen,
  • Yunjiang Zhang,
  • Xiangpeng Huang,
  • Xinlei Ge

摘要

Regional atmospheric pollution events still occur frequently in China despite the decline in PM2.5 concentrations in recent years. In order to investigate the chemical composition and pollution characteristics of atmospheric fine particulate matters measured by off-line soot particle aerosol mass spectrometer in Nanjing during the cold seasons, this study presented a comprehensive analysis of PM2.5 diurnal samples from October 10 to December 31 in the year 2020, which collected at a typical suburban site in Nanjing. Results showed that water-soluble inorganic ions dominated PM2.5 mass, with NH4+ primarily forming NH4NO3, (NH4)2SO4 and NH4Cl through secondary reactions. Excess NO3- was found in the form of Ca(NO3)2 and Mg(NO3)2. Emissions from vehicle exhaust significantly contributed to the inorganic component, and both organic and inorganic analyses indicated that biomass burning was a more significant primary source during the night. In terms of water-soluble organic components (WSOM), the average O/C, H/C, N/C, and organic matter to organic carbon ratio (OM/OC) were 0.48, 1.38, 0.03, and 1.79, respectively. Four OA factors were identified in WSOM: hydrocarbon-related OA from traffic emissions (HOA), mixed primary OA (MPOA), low oxidized OA (LO-OOA), and more oxidized OA (MO-OOA). Their daytime contributions were 10.6%, 25.6%, 35.5%, and 28.8%, while nighttime contributions were 9.7%, 33.5%, 32.9%, and 23.9%, respectively. Potential source contribution function (PSCF) analysis showed that Yangtze River Delta, North China, and Mongolia were major potential sources of PM2.5, highlighting the importance of coordinated measures to reduce PM2.5 in Nanjing.