GENEVA / RankWire.AI / – The World Health Organization (WHO) has released updated recommendations aimed at minimizing heat-related health issues during large gatherings worldwide. These guidelines specifically target major sporting, religious, and cultural events, addressing potential hazards for spectators, participants, volunteers, and staff who face extended exposure to high temperatures. An extensive review of evidence, covering studies from 1980 through 2025, identified nearly 500,000 medical visits at mass gatherings, with over 22,000 cases involving heat-related illnesses.
Findings indicate that well-organized medical support at event locations can manage most cases on-site without the need for hospital transfers. When organizers implement robust on-site medical services, over 90% of patients are treated at the venue, which helps ease the burden on local hospitals and ambulance networks. These insights are part of a comprehensive toolkit designed for governments, organizers, and health officials, combining research data with practical methods to evaluate and address heat risks before and during major events.
According to the guidance, heat-related fatalities have risen by an estimated 63% since the 1990s, with an average of 546,000 deaths annually between 2012 and 2021. Crowded settings can heighten exposure, especially when individuals spend long hours outdoors in extreme heat. Additional factors such as limited access to water, restricted movement, and travel-related stress can further increase these risks. The high demand for health services can also complicate medical responses during large-scale gatherings.
Heat preparedness now essential in event planning
The guidance advocates for essential amenities like accessible drinking water, sufficient sanitation facilities, and cooling infrastructure at event sites. It emphasizes the importance of adjusting schedules, improving crowd management, and implementing protective measures for staff and volunteers. Event organizers are encouraged to incorporate public messaging, real-time health monitoring, and prepared medical services into their planning processes. WHO stresses that heat protections should be integrated into the entire event operation rather than relying solely on individual actions. Factors like venue layout, transportation, security, and sanitation influence access to cooling and medical care.
The comprehensive package includes systematic reviews, an implementation manual, and a specific heat-risk assessment instrument. It also offers resources for crafting evidence-based public communications during periods of extreme heat. The assessment tool allows for structured, repeatable reviews before and during an event, supporting overall preparation, impact reduction, and recovery efforts. Organizers can align these measures with existing emergency protocols, occupational safety standards, and national heat-health action plans.
Scientific evidence underscores early intervention
The Intergovernmental Panel on Climate Change has documented that intense heat extremes have become more common and severe across most land regions since the 1950s. As a result, large outdoor or crowded gatherings pose additional health challenges, particularly for older adults, individuals with chronic conditions, and those engaged in physical activity. Workers and volunteers spending extended periods outside in supporting roles may also face heightened risks.
The guidance views heat management as a vital component of broader public health and emergency preparedness strategies for mass events. It urges authorities and organizers to continuously evaluate environmental conditions throughout the event lifecycle and to synchronize health protection efforts with operational planning. The recommended measures are applicable across various event types and sizes, including international sports competitions, festivals, and religious observances. The framework emphasizes prevention, early intervention, and on-site treatment while supporting existing national systems for heat-related health issues, emergency response, and clinical management.