The International Olympic Committee, as the main sports organization in the world, has several criteria for handing over the Olympic Games to the host city. One of the most critical concerns in hosting sports events is paying attention to environmental aspects and sustainable development. In fact, the applicant cities must have practical environmental goals and action plans. Basically, the host cities have made significant initiatives to improve the environment in previous Olympic Games, but according to the data and studies, this major sporting event has also had detrimental consequences on the environment. Given the importance of sustainable development and environmental protection, this study examines the negative impacts of mega-sporting events on the environment. Therefore data were collected from qualitative interviews, library studies, and previous research. Fifteen experts in the sports and environment field were selected as a sample by snowball distribution method and the interview steps were performed until the theoretical saturation was reached (20-40 min in 3 sessions). After summarizing and analyzing the data, it was found that the negative environmental externalities mainly occur in the Infrastructure and construction, Transportation, and Waste management domains. Emphasizing the findings, the result of this research can be used to identify key local environmental concerns, and pressure points and provide part of the solution for organizers seeking to use their time and resources as efficiently as possible in achieving environmental goals. Keywords: environmental factors, sustainable development, sport management, mega-sporting events, Olympic Games
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