AI Article Synopsis

  • The study compares fine particulate matter (PM) composition and characteristics during winter and summer at two locations: Gwangju Institute of Science and Technology in South Korea and Changping campus of Peking University in China.
  • While average PM concentrations were similar at both sites, significant differences in major components were observed, with Changping exhibiting higher primary organic carbon levels and Gwangju showing more secondary organic carbon.
  • The research highlights the need to recognize spatial and seasonal variations in air pollution, suggesting that revising organic mass to organic carbon (OM/OC) ratios could improve the accuracy of air quality research.

Article Abstract

This study evaluates the composition and seasonal characteristics of fine particulate matter (PM) during winter and summer through simultaneous measurements conducted at the Gwangju Institute of Science and Technology in South Korea and the Changping campus of Peking University in China. PM samples were concurrently collected at both sites, and chemical analyses were conducted to quantify various components, including carbonaceous materials, ionic species, and metals. Although the average PM concentrations were comparable between the two sites, there were distinct differences in the concentrations of major components. Organic indicator compounds were analyzed to discern the contributions of primary and secondary pollution sources. Changping displayed a mix of primary and secondary pollution, characterized by higher concentrations of primary organic carbon (POC) such as polycyclic aromatic hydrocarbons and hopanes, compared to Gwangju. In contrast, Gwangju demonstrated a higher prevalence of secondary organic carbon (SOC), particularly water-soluble organic carbon not related to biomass burning (WSOC) and various polar organic compounds. The organic mass to organic carbon (OM/OC) ratios estimated using the mass balance method revealed significant differences, with Gwangju showing a higher ratio of 2.3 compared to 1.9 at Changping, indicating a greater influence of secondary pollutants at Gwangju. Additionally, both Changping and Gwangju exhibited higher OM/OC ratios in summer (Changping: 2.0, Gwangju: 2.5) compared to winter (Changping: 1.8, Gwangju: 2.2), indicating seasonal differences in organic mass contributions to PM. These findings underscore the importance of accounting for spatial and seasonal variations in air pollution studies and suggest that updating commonly used OM/OC ratios could enhance the reliability of research outcomes.

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Source
http://dx.doi.org/10.1007/s11356-024-35246-xDOI Listing

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