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<p>Dairy barns are a crucial source of aerosol and airborne bacteria emissions. An investigation was conducted to report the indoor microclimatic factors, aerosols, and airborne bacteria in an enclosed type of dairy barn in Tochigi, Japan, from April 2017 to May 2018. A mean higher airflow (1.90&#xa0;m/sec), temperature (23.86&#xa0;°C), and relative humidity (RH) (88.69%) were found during the summer in the barn. Significant differences in airflow, temperature, and RH were found between the summer and winter in the barn. The concentrations of 0.3–2.0&#xa0;μm aerosols were greater during all the seasons, and the concentration of 2.0–10.0&#xa0;μm aerosols during winter was greater in the barn. Higher concentrations of aerobic bacteria, <i>Staphylococcus aureus</i> (<i>S. aureus</i>), and <i>Escherichia coli</i> (<i>E. coli</i>) were observed during the winter in the barn. A total of 11 significant relationships were observed among aerosols, airborne bacteria, and microclimatic factors. A significant positive relationship (<i>R</i> = 0.96, <i>p</i> = 0.01) was observed between the RH and 0.5–1.0&#xa0;μm aerosols during the autumn. A significant negative relationship (<i>R</i> = 0.96, <i>p</i> = 0.00) between 2.0–5.0&#xa0;μm aerosols and airborne <i>S. aureus</i> was observed during the summer. These findings will be crucial in mitigating aerosols and airborne bacteria in dairy barns. Clinical trial registration. Not applicable.</p>

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Relationships Among Aerosol Particles, Airborne Bacteria, and Microclimatic Factors in an Enclosed Dairy Milking Barn

  • 期刊论文

  • 发表日期：

    2025年3月6日

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  • Md. Aminul Islam,
  • Atsuo Ikeguchi,
  • Takanori Naide

摘要

Dairy barns are a crucial source of aerosol and airborne bacteria emissions. An investigation was conducted to report the indoor microclimatic factors, aerosols, and airborne bacteria in an enclosed type of dairy barn in Tochigi, Japan, from April 2017 to May 2018. A mean higher airflow (1.90 m/sec), temperature (23.86 °C), and relative humidity (RH) (88.69%) were found during the summer in the barn. Significant differences in airflow, temperature, and RH were found between the summer and winter in the barn. The concentrations of 0.3–2.0 μm aerosols were greater during all the seasons, and the concentration of 2.0–10.0 μm aerosols during winter was greater in the barn. Higher concentrations of aerobic bacteria, Staphylococcus aureus (S. aureus), and Escherichia coli (E. coli) were observed during the winter in the barn. A total of 11 significant relationships were observed among aerosols, airborne bacteria, and microclimatic factors. A significant positive relationship (R = 0.96, p = 0.01) was observed between the RH and 0.5–1.0 μm aerosols during the autumn. A significant negative relationship (R = 0.96, p = 0.00) between 2.0–5.0 μm aerosols and airborne S. aureus was observed during the summer. These findings will be crucial in mitigating aerosols and airborne bacteria in dairy barns. Clinical trial registration. Not applicable.