Urban sustainability can be considered as a part of sustainable development, which emphasizes the balance between three dimensions of environmental, economic, and social sustainability to improve human well-being and the quality of life. In this study, it was attempted to assess urban sustainability in the most critical, populous, and expanded district of Tehran (district 4) using sustainability assessment by fuzzy evaluation. For this purpose, 52 primary indices which were divided into 8 secondary components were employed. Among them, 18 indices for environmental issues were grouped into three secondary indices as E₁, to E₃, and 34 indices for economic–social and cultural issues were classified into five secondary indices as H₁ to H₅. The results revealed that 56% of the study area was potentially unsustainable and 44% of it had a medium sustainability in terms of environmental aspects. Furthermore, 65% of the study area had a medium human well-being sustainability and 35% of it was potentially unsustainable in terms of economic–social and cultural aspects. Finally, 45% of the study area was found unsuitable in terms of overall urban sustainability. The functional sample proposed in the present study can provide the directors and planners with the required information about the condition of sustainability in the most important district of Tehran.

城市可持续性可以被视为可持续发展的一部分，它强调了环境，经济和社会可持续性三个方面之间的平衡，以改善人类的福祉和生活质量。在这项研究中，尝试通过模糊评估的可持续性评估方法评估德黑兰最关键，人口最多和扩展区域（第4区）的城市可持续性。为此，采用了52个主要指标，这些指标被分为8个次要成分。其中，将环境问题的18个指标分为E ₁，E ₃到3个二级指标，将经济社会文化问题的34个指标分为H ₁到5个二级指标。至H ₅。结果表明，在环境方面，研究区域的56％可能是不可持续的，其中44％具有中等的可持续性。此外，研究区域的65％具有中等程度的人类福祉可持续性，而其中35％的经济，社会和文化方面具有潜在的不可持续性。最后，就整体城市可持续性而言，研究区域的45％被认为是不合适的。本研究中提出的功能样本可以为主管和规划人员提供有关德黑兰最重要地区的可持续性状况的必要信息。