TNAG-1516-FCO40-2077-Bridges-and-tunnels-in-Hong-Kong-1986 — Page 43

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3.0

3.1

3.1.1

AIR POLLUTION ASSESSMENT

Introduction

The assessment of future Carbon Monoxide concentration was carried out using the UK Transport Road and Research Laboratory computer method (TRRL LR1052 and SR806). Meteorological data on wind speed, wind direction and stability condition was obtained from synoptic data collected by the Hong Kong Royal Observatory.

3.1.2

Traffic flow data was based on the predicted maximum hourly flows presented in Figure

C2.

The average travelling speed was

taken as 50kph for all road sections.

3.1.3

The road network was segmented into 74 sections with 22 road assignments. Air pollution levels were determined taking into account pollution arising from emissions at the ventilation building.

3.2

3.2.1

Findings and Conclusions

For the maximum hourly traffic flow condition, it was estimated that the average Carbon Monoxide concentrations for the selected sites would be between 1.0 and 3.5 PPM with the exception of sites 5 and 6 which would experience 3.9 and 7.2 PPM respectively. With the most adverse conditions for wind speeds and directions all sites experience concentrations in a one hour period of less than 35 PPM.

3.2.2 These levels of Carbon Monoxide concentrations meet accepted standards and therefore it is concluded that the provisions made to minimise air pollution are adequate.

C4