Explanation of the Factors Affecting the Reduction of Air Pollution in Residential Neighborhoods of Tehran with an Emphasis on Green Walls

Urbanization phenomenon and cities population growth have led to the destruction of the environment in order to meet the needs of citizens. Urban life based on industry has created pollutants and increased air pollution in cities. One of the important approaches in the field of architecture and urban planning is to pay attention to nature as a model and a solution for adjusting environmental problems. In this regard, green walls can reduce air pollution on a small scale at the same time as providing green space. Therefore, it is important to identify the factors affecting the reduction of air pollution by using green walls, which is the main goal of this research. This paper is done through mixed methodology by developmental-applicative purpose. The statistical population is 20 architectural specialists and experts proficient in the field of research, design and implementation of green architecture projects who were systematically and purposefully interviewed. The research method was based on content analysis using MAXQDA2020 software. The results of the research indicate that green walls are effective in 8 main categories: "temperature and humidity balance", "air ventilation", "environmental diversity", "micro climate", "increasing the efficiency of building energy resources", "absorption of impurities and airborne particles", "enhancement of environmental quality" and "respiratory lungs” presented in the form of a model along with the components affecting them.