A study of roadside particulate in different microenvironments of Hong Kong

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A study of roadside particulate in different microenvironments of Hong Kong


Author: Kwok, Tsz-leung
Title: A study of roadside particulate in different microenvironments of Hong Kong
Degree: M.Sc.
Year: 1999
Subject: Air -- Pollution -- China -- Hong Kong -- Measurement
Motor vehicles -- Motors -- Exhaust gas -- Environmental aspects -- China -- Hong Kong
Transportation, Automotive -- Environmental aspects -- China -- Hong Kong
Roads -- China -- Hong Kong -- Environmental aspects
Air quality -- China -- Hong Kong
Hong Kong Polytechnic University -- Dissertations
Department: Multi-disciplinary Studies
Dept. of Civil and Structural Engineering
Pages: 72 leaves : ill., maps ; 31 cm
Language: English
InnoPac Record: http://library.polyu.edu.hk/record=b1460499
URI: http://theses.lib.polyu.edu.hk/handle/200/162
Abstract: It is a well-known fact that air pollution caused by motor vehicle emission is a serious problem in Hong Kong. The problem is aggravated by the high population density and the street canyon situation which is common in Hong Kong. In this research project field study data is used to evaluate the traffic related particulate air pollution at various roadside microenvironments in Hong Kong. This study employed the microenvironment monitoring technique to assess the exposure of pedestrian to respirable suspended particulate (RSP) and airborne lead (APb) at different roadside microenvironments. A total of 14 districts were selected to represent different land use categories including new town, residential, industrial and commercial area. Each land use category was further divided into different roadside microenvironments including junction, traffic-light, bus-stop and normal traffic. A total of 62 roadside sites were used for the microenvironment study. Pedestrian was found to expose to 24-hour average RSP ranged from 25.5ug/m3 at Taikoo Shing to 337.4ug/m3 at Central and APb from 70.71ng/m3 at Causeway Bay to 285.7ng/m3 at Mongkok and Tsim Sha Tsui respectively. The average was 101.84ug/m3 and 145.36ng/m3. The mean results are well within the HKAQO limit of RSP 24-hour average of 180ug/m3 and APb 3-month average of 1500ng/m3. However, a total of 8 exceedances of RSP limit was found. Comparison of four land use categories showed that the highest and lowest mean RSP values were found in commercial (125.l4ug/m3) and industrial (85.l4ug/m3) area respectively. The mean RSP within the same land use category was found to be quite different due to the variations in town development planning, street configuration, traffic flow and topographical condition. It was found that walkway near normal traffic was the microenvironment with less severe RSP pollutant concentration. Microenvironment effect such as local emission source from ventilation duct, street canyon, open junction, restricted traffic flow and proximity to traffic, all contributed to the concentration level. The temporal variation of RSP at most districts showed that Saturday and Sunday were associated with lower RSP concentration than weekdays. It was found that measurement at EPD monitoring stations do not reflect the exposure on ground level. Statistical analysis of the field data such as linear regression was performed to establish the relationship between RSP and APb among different districts, land use categories and microenvironment. Insignificant correlation was found between RSP and APb in most of the districts, land use categories and microenvironment. Meteorological parameters and traffic flow were found to relate to the exposure levels of RSP from the correlation analysis. Insignificant correlation was found among various traffic flow and APb level. In other words, the use of APb as vehicular derived pollution needed to be reassessed in the future due to gradual fading out of the use of leaded gasoline.

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