A study of bus commuter and pedestrian exposure to traffic air pollution in Hong Kong

Exposure of bus commuters and pedestrians were measured in Hong Kong, a densely populated Asian city. The study found that bus commuters were exposed to an average NO, NO2, SO2 and CO of 0.490 μL/L, 0.077 μL/L, 0.020 μL/L and 1.6 μL/L respectively, for trips lasting between 20 and 45 min. Exposure levels of pedestrians to hourly average NO, NO2, SO2 and CO were 0.156 μL/L, 0.051 μL/L, 0.011μL/L and 0.9 μL/L, respectively. Spatial and temporal variation of exposure levels were detected with ANOVA. In-bus concentrations were higher than out-bus concentrations at roadsides. Linear regression models were used to predict in-bus levels of NO, NO2 and SO2 from out-bus levels which in turn could be estimated from traffic flow. Fixed-station data were found to give an unreliable representation of exposure level.

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