Vertical monitoring of traffic-related air pollution (TRAP) in urban street canyons of Hong Kong

Paulina P.Y. WONG, Poh Chin LAI*, Ryan ALLEN, Wei CHENG, Martha LEE, Anthony TSUI, Robert TANG, Thuan Quoc THACH, Linwei TIAN, Michael BRAUER, Benjamin BARRATT

*Corresponding author for this work

Research output: Journal PublicationsJournal Article (refereed)peer-review

16 Citations (Scopus)


Rapid urbanization has significantly increased air pollution especially in urban regions with high traffic volumes. Existing methods for estimating traffic-related air pollution (TRAP) and TRAP-related health impacts are based on two-dimensional modelling. This paper describes a point-based methodology to monitor vertical pollutant concentrations in typical street canyons of Hong Kong. It explains the conceptual design, monitoring strategy and selection criteria for a limited number of receptor locations in street canyons to undertake field measurements for both outdoor exposure and indoor infiltration. It also expounds on the limitations and complications associated with field instrumentation and retention of participating home units. The empirical results were applied on the building infiltration efficiencies assessment. It is concluded that the cost-effective field methodology developed in this paper expects to strike a balance between exposure error and limited data locations. These findings will have important implications in future monitoring design of vertical TRAP exposure to support health studies.

Original languageEnglish
Pages (from-to)696-703
Number of pages8
JournalScience of the Total Environment
Early online date16 Mar 2019
Publication statusPublished - 20 Jun 2019


  • Air pollution
  • Canyon monitoring
  • Infiltration efficiencies
  • Spatial analysis
  • Vertical dispersion


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