Integrating travel behavior with land use regression to estimate dynamic air pollution exposure in Hong Kong

Robert Tang, Linwei Tian, Thuan-Quoc Thach, Tsz Him Tsui, Michael Brauer, Martha Lee, Ryan Allen, Weiran Yuchi, Poh-Chin Lai, Paulina Wong, Benjamin Barratt

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45 Citations (Scopus)
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Background Epidemiological studies typically use subjects' residential address to estimate individuals' air pollution exposure. However, in reality this exposure is rarely static as people move from home to work/study locations and commute during the day. Integrating mobility and time-activity data may reduce errors and biases, thereby improving estimates of health risks. Objectives To incorporate land use regression with movement and building infiltration data to estimate time-weighted air pollution exposures stratified by age, sex, and employment status for population subgroups in Hong Kong. Methods A large population-representative survey (N = 89,385) was used to characterize travel behavior, and derive time-activity pattern for each subject. Infiltration factors calculated from indoor/outdoor monitoring campaigns were used to estimate micro-environmental concentrations. We evaluated dynamic and static (residential location-only) exposures in a staged modeling approach to quantify effects of each component. Results Higher levels of exposures were found for working adults and students due to increased mobility. Compared to subjects aged 65 or older, exposures to PM2.5, BC, and NO2 were 13%, 39% and 14% higher, respectively for subjects aged below 18, and 3%, 18% and 11% higher, respectively for working adults. Exposures of females were approximately 4% lower than those of males. Dynamic exposures were around 20% lower than ambient exposures at residential addresses. Conclusions The incorporation of infiltration and mobility increased heterogeneity in population exposure and allowed identification of highly exposed groups. The use of ambient concentrations may lead to exposure misclassification which introduces bias, resulting in lower effect estimates than ‘true’ exposures.
Original languageEnglish
Pages (from-to)100-108
Number of pages9
JournalEnvironment International
Early online date6 Feb 2018
Publication statusPublished - Apr 2018


  • Air pollution
  • Dynamic exposure
  • Land use regression
  • Exposure assessment
  • Travel behavior
  • Time-activity


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