University of Isfahan Urban Economics 2588-4867 6 2 2021 10 23 Evaluating the impact of using city trains and buses on air quality(Case study: Mashhad) Evaluating the impact of using city trains and buses on air quality(Case study: Mashhad) 73 84 27758 10.22108/ue.2023.135946.1240 FA Narvan Ghodrati MSc Department of Economics, Faculty of Administrative and Economic Sciences, Ferdowsi University of Mashhad, Mashhad, Iran Taghi Ebrahimi Salary Associate Professor Department of Economics, Faculty of Administrative and Economic Sciences, Ferdowsi University of Mashhad, Mashhad, Iran Mahdi Behname Assistant Professor Department of Economics, Faculty of Administrative and Economic Sciences, Ferdowsi University of Mashhad, Mashhad, Iran Ebrahim Ghaed Ph.D. Student of Department of Economics, Faculty of Administrative and Economic Sciences, Ferdowsi University of Mashhad, Mashhad, Iran Journal Article 2022 12 04 The issue of scarcity and reduction of energy resources in the transportation sector on the one hand, and the air pollution crisis on the other hand, are the most important problems that have plagued the metropolises today. One of the ways to control energy consumption and air pollution in big cities like Mashhad is to develop public transportation, including buses, city trains, and taxis. This research is a descriptive-analytical study, the purpose of which is to compare the impact of the use of city trains and buses in the Mashhad metropolis on air quality in 2010-2019 using the mixed data sampling (MIDAS) regression models. The results indicate that using the city trains reduces the level of pollutants and improves the air quality index. Also, there is an inverse and significant relationship between the energy price variable and the air quality index, and it has been emphasized that the role of the bus is stronger than that of the city train on the air quality index. The issue of scarcity and reduction of energy resources in the transportation sector on the one hand, and the air pollution crisis on the other hand, are the most important problems that have plagued the metropolises today. One of the ways to control energy consumption and air pollution in big cities like Mashhad is to develop public transportation, including buses, city trains, and taxis. This research is a descriptive-analytical study, the purpose of which is to compare the impact of the use of city trains and buses in the Mashhad metropolis on air quality in 2010-2019 using the mixed data sampling (MIDAS) regression models. The results indicate that using the city trains reduces the level of pollutants and improves the air quality index. Also, there is an inverse and significant relationship between the energy price variable and the air quality index, and it has been emphasized that the role of the bus is stronger than that of the city train on the air quality index. https://ue.ui.ac.ir/article_27758_3e314e1efebb33ecd5b43de1d8754aab.pdf