URBAN AIR POLLUTION IDENTIFICATION OF VULNERABLE AREA IN THE CITY OF COLOMBO USING GIS TECHNOLOGY

摘要

Air pollution is a critical problem of urbanization and industrialization all over the world and there is no exception in Sri Lankan context where it has created number of problems in its capital city of Colombo. The study has examined the spatial variation in NO2 and SO2 concentration pertaining to air pollution and some areas have been identified as vulnerable areas. GIS technology has been used for various factors to display the spatial distribution pattern of air pollution. Other factors such as topographic features, weather conditions of the area have been considered even though in large areas climate may change within a short period. Air pollution is not similar everywhere due to land use pattern, surface temperature, vertical & horizontal space of the buildings and urbanization process. GIS model, spatial analysis, Regression analysis and many algorithms were used to represent the air pollution by using secondary data and Images. The methods of analysis of air pollution are very useful because of high resolution images & influential thermal bands. This study is based on the spatial distribution pattern of air pollution. It was therefore possible to draw maps for highly vulnerable sites by using multi criteria analysis.