Study of Particulate at Roadside Microenvironments in Selected Heavily Trafficked Districts in Hong Kong - Case Study

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 |.ig/m3 and 0.0707 to 0.2857 (.ig/m3. The average was 109.50 and 0.1445 j-ig/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.