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Traffic
Pollution Assessment and Control
A. Summary of activities
The Traffic Pollution Group was established to be a focus
for inter-disciplinary research and consultancy in the prediction, assessment
and control of traffic air and noise pollution. The Traffic Pollution Group is
well equipped with air and noise monitoring instruments. Activities include:
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Establishment
of vehicle exhaust emission factors. |
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Particulate
trap for small diesel vehicles. |
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Exposure
of transport commuters and pedestrians. |
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Traffic
noise control and design of noise barriers. |
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Traffic
and toxic air monitoring. |
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Measurement
and assessment of noise impact. |
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Education
and training for local engineers. |
B. Representative projects
| Study of the human
exposure to respirable suspended particulate in roadside microenvironments
of metropolitan Hong Kong |
 Exposure
levels and pattern of PM10 and PM2.5 was established in
the roadside microenvironments in the urban area of Hong Kong. The toxic nature
and chemical composition of the particulates in the roadside microenvironment
was assessed. Possible sources of PM10 and PM2.5 were
identified.
| Study on the human exposure in various transportation modes in Hong Kong |
 Indoor
pollution levels in various transportation modes in Hong Kong were measured.
Drivers’ exposure levels inside travelling vehicles were measured and the
effects on drivers’ exposure to vehicular air pollutants were assessed
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Design of absorptive barriers |
This consultancy project used
a new method for designing absorptive barrier for Castle Peak Road, Tsuen Wan.
Roadside barriers have to be erected on existing road in order to reduce the
noise impact on residents. However, if a high barrier or enclosure is erected,
initial cost and maintenance cost would be high. Also, due to other site
limitations (e.g., lighting problem, ventilation, and safety), this type of
barrier design is not acceptable to the Highways Department. A new absorptive
barrier design was proposed for this road widening project in Castle Peak Road with reduced cost of
installation.
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Application of absorptive and diffusive
materials to traffic noise barriers |
The research project aims to
improve barrier designs with absorptive and diffusive materials so that their
performance is optimized.
Scale
model for parallel barrier prediction
The new barrier design would
increase the insertion loss of barriers by reducing the reflection and
increasing diffusion. It will also reduce the height of the barrier. The
improved reliability and efficiency of noise barriers demonstrated in this
project will give highway engineers a more cost-effective design at less
maintenance cost.
C. Major facilities
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Traffic
air pollutant monitors including: CO, NOx, O3, SO2,
TSP, RSP, PM2.5 and toxic VOC, GC/MS, GC/FID |
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Anechoic
room & reverberant room |
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Impedance
tube sound absorption test |
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Acoustically
scale modelling |
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Vibration
meter & real time / FFT frequency spectrum analyzer |
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Sound
level meter & real time / FFT frequency spectrum analyzer |
D. Selected recent output
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Chan L. Y., Chan C.
Y. and Qin Y., The effect of commuting microenvironment on the commuter
exposures to vehicular emission in Hong Kong, Journal of Atmospheric
Environment, Vol. 33, pp.1777-1787, 1999. |
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Chan L. Y., Kwok W.
S. and Chan C. Y., Human exposure to respirable suspended particulate and
airborne lead in different microenvironment, Chemosphere. (In press) |
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Chan L. Y., Zheung
L., Qin Y. and Lee S. C., CO concentration inside the cross harbor tunnel in
Hong Kong. Environmental International, Vol. 22, pp.405-409, 1996. |
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Hung, W.T., "Pedestrian Behaviour.at Signalized
junctions" at The Fourth Conference of Hong Kong Society for
Transportation Studies held By the HKSTS, 4 December 1999, Harbour Holiday
Hotel, Hong Kong. |
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Hung, W.T., "LPG Taxi Programme in Hong
Kong", Proceddings, The Sixth Mainland-Taiwan Environmental Protection
Conference, Sun Yat-sen University, Kaohsiung, Taiwan, 7-11 December 1999,
pp 1361-1366. |
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Hung, W.T., "Indicators for sustainable
transport policy", Proceedings of Better Air Quality: Motor Vehicle
Control and Technology Workshop, 18-20 September 2000, Hong Kong Polytechnic
University, Hong Kong. |
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Tong, H.Y. and Hung, W.T., "Department headway
at signal controlled junctions in Hong Kong", Proceedings of the 5th
Meeting of Hong Kong society for Transportation Studies, 2 December 2000,
Hong Kong, pp158-165. |
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Hung, W.T. and Tong, H.Y., "Review of vehicle
emissions and fuel consumption modelling approaches at signalized road
network", Proceedings of the 5th Meeting of Hong Kong society for
Transportation Studies, 2 December 2000, Hong Kong, pp234-239 |
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Hung, W.T.; Cheung, C.S.; Ha, K. and Hung, A., edited
Proceedings for Better Air Quality Workshop 2000, September 2000. 615 pages
(Chinese and English versions). |
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Hung,W.T. "Environmental Neglect in Transport
Policy", Modern Transport in Hong Kong for the 21st Century, Edited by
Yeh, A., Hills, P., and Ng, S., CUPEM, HKU, 2001, pp163-174. |
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Tong, H.Y., Hung, W.T. and Cheung, C.S.,
"Development of a driving cycle of Hong Kong:, Atmospheric Science 33
(1999) Elsevier Science, pp 2323-2325. |
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Zhao, H., Cheung C.S. and Hung W.T.,
"Determination of emission factors of motor vehicles in Hong Kong from
the on-road emission measurements", Transactions of CSICE, Vol.
17(1999) No. 1, pp .47-52. |
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Tong,H.Y., Hung, W.T., and Cheung, C.S.,
"On-road motor vehicle emissions and fuel consumption in urban driving
conditions.", Journal of the Air & Waste Management Association,
Volume 50, April 2000, pp543-554. |
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Lai Y. K., Ng C. F.,
Experimental study of acoustic wave propagation through resonating devices,
Building Acoustics, Vol. 5, No. 1, pp.39-55, 1998. |
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Lee Y. Y., Ng C. F.,
Sound insertion loss of stiffened enclosure plates using the finite element
method and classical approach, Journal of Sound and Vibration, 217(2),
pp.239-260, 1998. |
| Tang W. C., Ng C. F.,
Low frequency acoustic performance of close-fitting sandwich plane, Building
Acoustics, Vol. 5, No. 3, pp.143-161, 1999. |
E. Contact person
Dr. L. Y. Chan, Associate Professor
Tel:(852) 2766
6026, Fax: (852) 2334 6389, Email: celychan@polyu.edu.hk
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