An assessment of airborne fungi exposure risk level in air-conditioned offices

Ling Tim Wong, W. Y. Chan, Kwok Wai Mui, P. S. Hui

Research output: Journal article publicationJournal articleAcademic researchpeer-review

11 Citations (Scopus)


The exposure to airborne fungi has not been included in many regular indoor air quality (IAQ) assessments of air-conditioned (A/C) offices. This study examined the feasibility of using a proposed relative index of fungal exposure (RIFE) as a quantitative measure to specify the enclosure effect of an indoor environment in 82 Hong Kong A/C offices. The airborne fungi count ranged from 2 to 92CFU •m-3. Yeast, Aspergillus, Cladosporium, and Penicillium were reported as dominant in the offices. The RIFE of Yeast, Aspergillus, and Penicillium were 1.26, 1.21, and 1.02, respectively, and it would confirm a higher indoor exposure risk relative to that of outdoors. The RIFE of the common outdoor fungi Cladosporium was 0.48. This study presents a useful index for IAQ assessment regarding relative risk exposure of airborne fungi in A/C offices.
Original languageEnglish
Pages (from-to)553-561
Number of pages9
JournalIndoor and Built Environment
Issue number6
Publication statusPublished - 1 Dec 2009


  • Airborne fungi
  • Indoor air quality
  • Relative index of fungal exposure (RIFE)
  • Risk assessment

ASJC Scopus subject areas

  • Public Health, Environmental and Occupational Health


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