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      Microbial concentration and particle size distribution characteristics of indoor air in colleges and universities in winter

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          Abstract

          Objective To understand the microbial pollution of indoor air in colleges and universities, and to provide a reference for controlling microbial pollution and improving indoor air quality.

          Methods In November 2018, the air microorganisms in different functional areas and at different times were sampled and cultured in a university in Beijing by Anderson’s six-level sampler.

          Results During the test, there were differences in microbial aerosol concentrations in different functional areas and at different times ( F = 3.99, 7.77, P<0.05), the concentration of bacteria in toilets was relatively high, the average concentration is 659 CFU/m 3 and the concentration of fungi in the campus was relatively high, the average concentration is 660 CFU/m 3; the concentration of bacteria and fungi in the air at 12 o’ clock noon was relatively low, the average concentration is 320 CFU/m 3 and 322 CFU/ m 3. The particle size distribution of microorganisms in the air presents roughly the same law, and the peak concentration of microbial concentrations occurs at the IV and V levels (1.1−3.3 μm), in which the highest concentration of bacteria (253 CFU/m 3) appears at the V level, and the highest concentration of fungi (249 CFU/m 3) appears at the IV level.

          Conclusion The microbial concentration in the air of colleges and universities is mainly concentrated in the size of 1.1−3.3 μm, and it is necessary to take targeted comprehensive control measures to effectively improve air quality.

          Abstract

          【摘要】目的 了解髙校空气中微生物污染情况, 为控制微生物污染和改善室内空气品质提供参考。 方法 于2018 年 11 月, 采用安德森六级采样器对北京市某髙校不同功能区、不同时态的空气微生物进行采样并培养。 结果 在测试期 间, 不同功能区、不同时态的微生物气溶胶体积浓度差异有统计学意义( F 值分别为 3.99, 7.77, P 值均<0.05), 卫生间的细 菌体积浓度相对较髙, 平均体积浓度为 659 CFU/m 3, 校园的真菌体积浓度相对较髙, 平均体积浓度为 660 CFU/m 3;12:00 的空气中细菌和真菌体积浓度相对较低, 平均体积浓度分别为 320 和 322 CFU/m 3。空气中微生物的粒径分布特征呈现大 致相同的规律, 微生物体积浓度峰值集中出现在IV, V级(1.1 ~ 3.3 μm), 其中细菌最髙体积浓度值为 253 CFU/m 3, 出现在 V级;真菌最髙体积浓度值为 249 CFU/m 3, 出现在IV级。 结论 髙校空气中的微生物体积浓度主要集中在 1.1~3.3 μm 粒 径大小。需采取有针对性的综合防治措施来改善空气品质。

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          Author and article information

          Journal
          CJSH
          Chinese Journal of School Health
          Chinese Journal of School Health (China )
          1000-9817
          01 November 2019
          01 February 2020
          : 40
          : 11
          : 1706-1708
          Affiliations
          [1] 1Beijing University of Civil Engineering and Architecture, Beijing (100044), China
          Article
          j.cnki.1000-9817.2019.11.030
          10.16835/j.cnki.1000-9817.2019.11.030
          178c0312-bbaa-4f42-b4a3-c5f8f8b14473
          © 2019 Chinese Journal of School Health

          This is an open-access article distributed under the terms of the Creative Commons Attribution 4.0 Unported License (CC BY-NC 4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. See https://creativecommons.org/licenses/by-nc/4.0/.

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          Self URI (journal-page): http://www.cjsh.org.cn
          Categories
          Journal Article

          Ophthalmology & Optometry,Pediatrics,Nutrition & Dietetics,Clinical Psychology & Psychiatry,Public health
          Public health,Air pollution, indoor,Students,Air microbiology

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