Time and Space Changes of Air Pollutants Using GIS (Case Study: North Semnan Tehran
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Abstract :
Tehran's metropolitan area is considered one of the most polluting cities in the world due to population concentration, indoor and suburban industries, vehicular traffic, high fossil fuel consumption, special geographical location, unique climate and topographic features. Not be The main objective of this study was to investigate and analyze the temporal and spatial behavior of pollutants (carbon monoxide, nitrogen dioxide, troposphere ozone, suspended particles, and sulfur dioxide) in the northern part of Tehran. In order to investigate the changes of air pollutants in temporal and spatial scales, data from meteorological stations and pollutant stations were used by Air Quality Control Company and Tehran Environmental Organization during the years 1387- 1387. Data were calculated using SPSS and Excel software and the results of statistical analyzes of the distribution of pollutants in spatial and temporal scales using Arc GIS 9.3 software and the Inverse Distance Inverse Interpolation (IDW) function as maps Tables and charts are prepared and drawn up. Based on the results of the study, the concentration of three pollutants of carbon monoxide, nitrogen dioxide and sulfur dioxide in the winter peak, but the concentration of suspended particles and ozone troposphere in summer is higher. All pollutants showed significant correlation with climatic elements. The correlation coefficient of carbon monoxide, nitrogen dioxide and sulfur dioxide with negative wind and positive pressure and surface temperature are positive. The correlation of ozone and particulate matter with the temperature and wind speed is positive and with negative pressure and humidity. Spatial distribution of centers with severe pollution is mainly due to the severity of pollution, mainly around the crisis headquarters, the Municipality of District 7, Sharif University and the Rocks Park, Aqdasiya and Puncak
