Study of Particulate at Roadside Micro-environments in Selected Heavily Trafficked Districts in Hong Kong
L.Y. Chan, W.S. Kwok, and C.Y. Chan, The Hong Kong Polytechnic University, Hung Hom, Hong Kong November - February 1997

Presented at the 91st Annual AWMA Meeting, June 14-18, 1998

Abstract
This research aimed at using the field study data from November 1996 to February 1997 to evaluate the particulate air pollution in selected roadside microenvironments in Hong Kong. The study employed microenvironment monitoring technique to access the exposure of pedestrian to respirable suspended particulate and airborne lead at heavily trafficked roadside. A total of 62 roadside sites in 14 districts were selected which covered the most urbanized and densely populated area. It was found that pedestrians exposed to 24-hour average RSP and airborne lead typically ranged from 25.56 to 337.40 ug/m3 and 0.0707 to 0.2857 ug/m3 . The average was 109.50 and 0.1445 ug/m3 respectively. Moreover, the field data was compared with the data of Environmental Protection Department (EPD) measured at low roof top and street level monitoring stations. It was found that measurement at EPD monitoring stations might not reflect the actual roadside exposure. Most field study data was significantly higher than the nearby fixed station data. The effects of the different roadside microenvironment and landuse pattern RSP and airborne lead concentration

Result and Discussion
The MiniVol™ Portable Sampler is a new PM10 monitor and its performance is still under study. Hence, we had performed comparison data from the collocated portable and of the high-volume sampler to assess the performance of the portable sampler relative to a EPA reference methods. The average ratio of mini-volume to high-volume sampler was 1.07. The square of the correlation coefficient was 0.9551. That is, the correlation between portable sampler data and high volume PM10 sampler is good .

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