Investigation of Tehran green Space changes and its role in air pollution Using LANDSAT images from 1980-2010

Because of geographical position of Tehran and existence of mountains in the northern part of it, transmit of the northwest prevailing wind to discharge pollution caused by urban activities seems to be complicated and also, construction of industrial factories in the city space and high amount of urban transportation, crisis the air in Tehran. So, study of the amount of green space and their change and role to reducing air pollution in Tehran - caused by urban activity- has highly importance. The purpose of this study is green space developments per capita during the past three decades and its role in the evolution of present air pollution in Tehran. The study areas have been conducted in the Great Tehran about 730 Square kilometers. To implement of this study, LANDSAT imagery of 4 and 5 TM and ETM sensors in the past thirty years have been used. At first radiometric and geometric correction and coordinates unification of all images. The images of study area in Tehran have been selected and then using maximum likelihood classification algorithms for image classification and extracting of plant cover layer and green space done. In this section by using the region borders green space was calculated per capital and thematic map was presented. By using long time Tehran pollution zoning maps, all 22 regions of Tehran in term of pollution have been ranked. And at last correlation between the amount of air pollution and green space was observed. The results show that, at first, the amount of green space per capita was undesirable than the global Standard and at the second, the role of green space to reduce pollution in different areas of Tehran has been impressive.

Keywords:

per capital green space , satellite images , air pollution , and correlation