عنوان مقاله [English]
Tehran metropolis is one of the most polluted cities in the world due to population concentration, establishment of industries in and around the city, vehicle traffic, high consumption of fossil fuels, special geographical location, unique climate and special topographic features. . The main purpose of this study is to investigate the temporal and spatial behavior of pollutants (carbon monoxide, nitrogen dioxide, tropospheric ozone, particulate matter, and sulfur dioxide) in the northern half of Tehran. In order to investigate the changes of air pollutants in temporal and spatial scales, the data of meteorological and pollution stations of the Air Quality Control Company and Tehran Environment Organization during the years 1391-1387 were used. Data were calculated using SPSS Excel Excel software and the results of statistical analysis of pollutant distribution at temporal and spatial scales with ArcGIS 9.3 software and with reverse distance interpolation (IDW) analytical function as maps. , Tables and graphs are prepared and drawn. According to the results of the study, the concentrations of three pollutants, carbon monoxide, nitrogen dioxide and sulfur dioxide, reach a maximum in winter, but the concentration of suspended particles and tropospheric ozone is higher in summer. All pollutants showed a significant correlation with climatic elements. The correlation coefficient of carbon monoxide, nitrogen dioxide and sulfur dioxide is negative with wind and positive with temperature and surface pressure. The correlation between ozone and suspended particles is positive with temperature and wind speed and with negative pressure and humidity. Spatial distribution of highly polluted centers is mainly around the Crisis Headquarters, District 7 Municipality, Sharif University and Rose Park, Aqdasiyeh and Punak.