mahtab amraei

In recent decades, Tabriz metropolis as the largest city in the northwest of the country has faced with increasing population growth and development of industrial, commercial, services and residential structures. Increasing development along with failure to comply with land use planning criteria has led to an increase in air pollution. Current study has been carried out in order to understand factors causing pollution in Tabriz city. Research method is descriptive analytical and the type of the information is documental- library. Eight indicators, i.e. floor area ratio, population density, intersection density, bus stop density, industries density, green spaces density, distance from industries and elevation were used as predictor variable. NO2 concentration was used as dependent variable and wind flow was used as an emission factor. In order to analyze the data, ordinary least squares and geographically weighted regression was used. According to the results of ordinary least square, the relationship between predictor variables and dependent variable is significant. So that the concentration of nitrogen dioxide increases with increase in floor area ratio, population density, intersection density, bus stop density, and industries density. In fact, there is a direct correlation between these variables and the concentration of nitrogen dioxide. By increasing the elevation and the distance from industries, the concentration of this pollutant decreases, which indicates an inverse correlation between these two variables and the dependent variable. Based on the results of geographically weighted regression model, considered variables account for 62% of air pollution in the city. Finally, maps of spatial variations of independent variables were drawn by using geographic weighted regression in the city of Tabriz.

Today, buses are the most important means of public transportation in most citiesof our country, as well as in most developing countries. There is little investmentneeded to launch a bus; and it does not depend on a specific route compared to other mass transit systems. It can be developed and changed. It also has a lower level of urban space compared to other vehicles; it is a priority in terms of cost savings and urban bus traffic reduction for many vehicles. In this study, in order to evaluate the satisfaction of Maragheh citizens from the interurban bus system, 200 people were selected as sample in each region of the city. Data were analyzed by SPSS and Minitab software and data output through the test T single-sample and ANOVA tests, and these results were achieved; most users of urban buses are women, educated people, and people with an income of less than one million. In the first hypothesis, the data output was calculated through a single-sample Ttest, it was found that there are some satisfactions in such cases as: bus timing, time saving, security for women, reduced traffic, reduced pollution, etc. However, there is not enough satisfaction in such cases as: drivers' behavior, ticket costs, and the number of stations. In the second hypothesis, using ANOVA, it was found that there is a difference between the different regions of the city in terms of satisfaction with the intercity bus system.