The concept of urban livability is defined as the quality of life and wellbeing of urban residents. That is the interpolation of people, environment and built environment. Among the components of natural environment, climate is playing the most important and significant role. Two types of data were measured for calculating the thermal comfort in the study area. Subjective and objective evaluations which present qualitative and quantitative data. Objective data incudes micrometeorological and site measurements. Subjective data evaluates perceptual sensation vote of thermal comfort by people using the urban open spaces in three hot days of August 2018. The physiologically equivalent temperature, mean radiant temperature, sky view factor and aspect ratio are selected in this research for evaluating thermal comfort in the urban areas. Results showed extreme heat stress for all measuring points. In the deep streets the lowest value of PET were seen and confirmed the geometry of canyons in thermal comfort. This research proved that the climatic consideration for improving the quality of life and livability is missing and urban designers and planners should rethink and review the comprehensive plan of Tehran to make a livable and sustainable city in the future.

城市宜居性的概念被定义为城市居民的生活质量和福祉。那就是人，环境和建筑环境的插值。在自然环境的各个组成部分中，气候起着最重要和最重要的作用。测量了两种类型的数据以计算研究区域的热舒适度。主观和客观评估，可提供定性和定量数据。客观数据包括微气象和现场测量。主观数据评估了在2018年8月的三个炎热天气中使用城市开放空间的人们对热舒适的感知感觉投票。在这项研究中，选择生理等效温度，平均辐射温度，天空因子和长宽比来评估室内的热舒适。城市地区。结果显示所有测量点的极端热应力。在狭窄的街道上，看到了最低的PET值，并证实了峡谷的几何形状具有热舒适性。这项研究证明，缺少改善生活质量和宜居性的气候考虑因素，城市设计师和规划人员应重新考虑和审查德黑兰的全面规划，以使未来成为宜居和可持续的城市。