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Air pollution is an offspring of industrial development exacerbated by population growth and urbanization. Nowadays, this has turned out to be one of the major problems of metropolitans. Being the most populated city of Iran, having specific geographical features, and being home to more than %20 of all Iranian industries, Tehran also suffers from air pollution. Many of these factories are located in district 21 of Tehran where 1391.9 hectares (27 percent) of the area is allocated to industries making it a congruent subject for the present study. This study aims to analyze and assess regional and transregional impacts of industrial activities in district 21 of Tehran. Research methodology of the study was analytic-evaluative (content analysis_ case study). Data analysis was performed using the IHWP fuzzy model. In the first part of the present study 8 indices such as air, water, soil pollution, etc. were enumerated and the environmental impacts of the industries active in the district. The results showed that 10 industrial units are at very low damage level, 82 units are at low damage level, 204 units are at medium damage level, 96 units at high damage level, and 8 units at very high damage level where area 2 of district 21 is much more polluted. In the second part of the study, the transregional impacts of industries in district 21 on neighboring districts were brought into focus. The results showed that district 18 has been affected by impacts of district 21, more than other districts. DOI: 10.5901/ajis.2016.v5n3s1p460

Analysis and Assessment of the Regional and Transregional Impacts of Industrial Activities in District 21 of Tehran