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Airborne bacterial assemblage in a zero carbon building: A case study.

M H Y Leung1, X Tong1, J C K Tong2

  • 1School of Energy and Environment, City University of Hong Kong, Kowloon, Hong Kong.

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Airborne bacteria in a zero carbon building (ZCB) were studied. Outdoor bacteria significantly influenced indoor air, similar to conventional buildings, despite ZCB

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Area of Science:

  • Microbiology
  • Environmental Science
  • Building Science

Background:

  • Limited data exists on airborne bacterial communities within green buildings.
  • Zero Carbon Buildings (ZCBs) represent a growing sector of sustainable architecture.
  • Understanding indoor microbial ecosystems is crucial for occupant health and building performance.

Purpose of the Study:

  • To characterize the airborne bacterial community in a Hong Kong Zero Carbon Building (ZCB).
  • To investigate the temporal dynamics and sources of indoor airborne bacteria in a ZCB.
  • To compare the ZCB's airborne bacterial profile with conventional built environments.

Main Methods:

  • Targeted sequencing of the bacterial 16S rRNA gene.
  • Analysis of community diversity, membership, and composition over time.
  • Bayesian source-tracking to identify bacterial origins.

Main Results:

  • Outdoor airborne bacteria were the dominant source of indoor bacteria in the ZCB.
  • Temporal variations in bacterial community diversity and composition were observed, influenced by season and location.
  • The ZCB's airborne bacterial assemblage and temporal patterns were comparable to conventional buildings.

Conclusions:

  • The study highlights the significant influence of outdoor air on indoor airborne bacteria in a ZCB.
  • Despite unique architectural features, the ZCB's microbial profile did not substantially differ from conventional buildings.
  • Further research on ZCBs is needed to understand the impact of specific architectural attributes on indoor airborne bacteria.