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In modern society, much time is spent indoors. Controlling indoor air quality is an important factor for human health. Recent studies have shown that the alpha diversity of microbial communities is related to the risk of allergies and asthma in occupants. It is possible that human health benefits from living in harmony with a diverse microbial community rather than overcontrolling it. Therefore, the microbial diversity index can serve as an indicator of whether the indoor microbial environment is healthy for humans. Our previous studies showed that the quantitative and qualitative structures of indoor eukaryotic and bacterial communities are related to temperature, relative humidity, and airtightness. It is assumed that a similar relationship exists for the diversity index and that it is possible to control the diversity index using indoor environmental factors. However, the quantitative relationship between these factors and microbial community diversity remains unclear. In this study, the indoor thermal environments of houses were characterized from indoor environmental measurements obtained from several houses in urban and rural areas of Japan using statistical analysis. In addition, the impact of these results on the diversity index (Shannon index) of eukaryotic and bacterial communities in indoor and outdoor air was evaluated. The results indicated that bacterial and eukaryotic community diversity indices were related to temperature and absolute humidity, especially in detached houses during winter. These findings may inform the development of indoor environmental control strategies aimed at promoting healthier microbial exposure for occupants.

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Microbial Communities in Japanese Residences: Part 3 Relationship Between Eukaryotic and Bacterial Diversity in Indoor Air and Environmental Factors

  • 会议论文

  • 发表日期：

    2026年

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  • Yuki Yananose,
  • Jianjian Hou,
  • Makiko Nakajima,
  • Tomohide Akiyama,
  • Daisuke Ogura,
  • Fumito Maruyama,
  • Jun Noda,
  • So Fujiyoshi

摘要

In modern society, much time is spent indoors. Controlling indoor air quality is an important factor for human health. Recent studies have shown that the alpha diversity of microbial communities is related to the risk of allergies and asthma in occupants. It is possible that human health benefits from living in harmony with a diverse microbial community rather than overcontrolling it. Therefore, the microbial diversity index can serve as an indicator of whether the indoor microbial environment is healthy for humans. Our previous studies showed that the quantitative and qualitative structures of indoor eukaryotic and bacterial communities are related to temperature, relative humidity, and airtightness. It is assumed that a similar relationship exists for the diversity index and that it is possible to control the diversity index using indoor environmental factors. However, the quantitative relationship between these factors and microbial community diversity remains unclear. In this study, the indoor thermal environments of houses were characterized from indoor environmental measurements obtained from several houses in urban and rural areas of Japan using statistical analysis. In addition, the impact of these results on the diversity index (Shannon index) of eukaryotic and bacterial communities in indoor and outdoor air was evaluated. The results indicated that bacterial and eukaryotic community diversity indices were related to temperature and absolute humidity, especially in detached houses during winter. These findings may inform the development of indoor environmental control strategies aimed at promoting healthier microbial exposure for occupants.