On-site measurements of ventilation performance and indoor air quality in naturally ventilated high-rise residential buildings in Hong Kong

Z. T. Ai, Cheuk Ming Mak, D. J. Cui

Research output: Journal article publicationJournal articleAcademic researchpeer-review

26 Citations (Scopus)


In addition, the incursion of outdoor pollutants into the interior through a ventilation opening has been recognized as a serious threat to indoor air quality (IAQ). This article presents on-site measurements of the ventilation performance and IAQ in four high-rise residential rooms in Hong Kong. Key parameters including the air changes per hour, respirable suspended particulate matters (PM: PM10 and PM2.5), and total volatile organic compounds were continuously recorded over a specified period. A comparison of cases with floor-extended and window-like openings is made. The results indicate that single-sided ventilation performs well regardless of the orientation of the apartment room and the configuration of the opening. Previous empirical models based on single-room buildings are not reliable in determining the ventilation rate of high-rise buildings. The measurements reported here also identify an important route for the incursion of outdoor pollutants, namely the downward re-entry of aerosol particles from an upper unit to a lower unit in the same building. A combination of gravitational and wind effects means this downward transport route significantly increases the PM10 and PM2.5 concentrations in the lower room.
Original languageEnglish
Pages (from-to)214-224
Number of pages11
JournalIndoor and Built Environment
Issue number2
Publication statusPublished - 1 Jan 2015


  • ACH
  • High-rise buildings
  • On-site measurement
  • PM10
  • PM2.5

ASJC Scopus subject areas

  • Public Health, Environmental and Occupational Health

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