Determining Air Pollution Potential Using Geographic Information Systems and Multi-criteria Evaluation: A Case Study in Isfahan Province in Iran

Abstract

This paper presents a methodology of determining the air pollution potential based on pollutant source identification and meteorological parameters, using as a case study the Isfahan Province in Iran. First, taking the county as the evaluation unit, the regional air pollution information system database of Isfahan Province was established, supported by Geographic Information Systems. Then, the air pollution potential of the study area was assessed based on the analysis of regional air pollution, review of available literature, seeking advice from experts, and using determining factors such as population density, traffic, industries, wind speed, precipitation, temperature and humidity. A layer for each factor was prepared in GIS. After data acquisition, criteria were set and weighted by experts. Finally, all criteria were integrated using the Weighted Linear Combination method to obtain the spatial distribution of air pollution potential. The results showed that 55 % of the total land area in Isfahan Province maintains a high to moderate level of air pollution potential resulting from unsuitable meteorological conditions along with high density of emissions from human activities. However, winds counteract the serious air pollution in some parts. The results suggest that very strict air quality management is needed in days of low wind speed, especially at places of increased air pollution resulting from human activities.