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<p>Ambient bioaerosols in PM<sub>2.5</sub> samples were measured in the cities of Wuhan and Huangshi in the province of Hubei, central China, from December 2018 to January 2019. The concentrations and size distributions of the bioaerosols in PM<sub>2.5</sub> were determined using fluorescent staining with DAPI (4',6-diamidino-2-phenylindole) and microscopic imaging. The bioaerosol contribution to the mass and organic carbon (OC) of PM<sub>2.5</sub> was estimated. Additionally, we determined the carbonaceous fractions of three types of biological particle, including bacteria, fungal spores, and pollen. The average number concentrations of PM<sub>2.5</sub> bioaerosol were1.64 # cm<sup>−3</sup> and 1.98 # cm<sup>−3</sup> in Wuhan and Huangshi, respectively. The dominant particle size of bioaerosols in both cities was 0.56–1.00&#xa0;μm. Bioaerosols were a significant component of PM<sub>2.5</sub>, accounting for 3.29% and 4.97% of the PM<sub>2.5</sub> mass in Wuhan and Huangshi, respectively, and 5.42% and 9.27% of the PM<sub>2.5</sub> OC. The results for the carbonaceous fractions of the biological particles show that a high OC/TC ratio and high levels of OC3 are important characteristics. These results have enabled us to understand the contribution of bioaerosols to carbonaceous fractions, which is useful for tracing aerosol sources.</p>

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Contributions of Bioaerosols to the Carbonaceous Fractions of PM2.5 in Two Chinese Cities

  • 期刊论文

  • 发表日期：

    2026年3月26日

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  • Ting Liu,
  • Dong Xiang,
  • Changlin Zhan,
  • Zhi Liu,
  • Jiaquan Zhang,
  • Wensheng Xiao,
  • Xianli Liu

摘要

Ambient bioaerosols in PM2.5 samples were measured in the cities of Wuhan and Huangshi in the province of Hubei, central China, from December 2018 to January 2019. The concentrations and size distributions of the bioaerosols in PM2.5 were determined using fluorescent staining with DAPI (4',6-diamidino-2-phenylindole) and microscopic imaging. The bioaerosol contribution to the mass and organic carbon (OC) of PM2.5 was estimated. Additionally, we determined the carbonaceous fractions of three types of biological particle, including bacteria, fungal spores, and pollen. The average number concentrations of PM2.5 bioaerosol were1.64 # cm−3 and 1.98 # cm−3 in Wuhan and Huangshi, respectively. The dominant particle size of bioaerosols in both cities was 0.56–1.00 μm. Bioaerosols were a significant component of PM2.5, accounting for 3.29% and 4.97% of the PM2.5 mass in Wuhan and Huangshi, respectively, and 5.42% and 9.27% of the PM2.5 OC. The results for the carbonaceous fractions of the biological particles show that a high OC/TC ratio and high levels of OC3 are important characteristics. These results have enabled us to understand the contribution of bioaerosols to carbonaceous fractions, which is useful for tracing aerosol sources.