GENEVA / RankWire.AI / – The World Health Organization (WHO) has introduced updated guidance aimed at minimizing heat-related health issues during mass gatherings around the globe. These recommendations address major sporting, religious, and cultural events. They focus on protecting spectators, participants, volunteers, and staff who are exposed to extended periods of high temperatures. An extensive review of evidence revealed nearly 500,000 medical encounters at mass gatherings in studies published from 1980 through 2025. Of these, more than 22,000 cases involved heat-related conditions.
The review indicates that well-organized medical services at event locations can manage most cases without the need for hospital transfers. Over 90% of individuals received treatment on-site when organizers had effective medical systems in place. This strategy can help ease the burden on local hospitals and ambulance services. The findings are part of a comprehensive package for governments, event organizers, and health authorities. It combines research insights with practical tools to evaluate and mitigate heat risks before and during major gatherings.
According to the guidance, heat-related fatalities have risen by an estimated 63% since the 1990s. Between 2012 and 2021, an average of 546,000 heat-related deaths occurred annually. Crowded environments can heighten exposure, especially when individuals remain outdoors in high temperatures for prolonged periods. Additional factors such as limited access to water, restricted movement, and travel-related stress can increase these risks. The high demand on health services can further complicate medical response efforts during large-scale events.
Incorporating heat mitigation strategies into event operations
The guidance advocates for provisions such as accessible drinking water, sufficient toilets, and cooling infrastructure at venues. It also recommends adjusting event schedules, improving crowd management, and implementing protective measures for staff working outdoors. Organizers should incorporate public communication strategies, real-time health surveillance, and ready medical services into their planning. WHO emphasizes that heat protection measures should be integrated throughout the entire event rather than relying mainly on individual actions. Venue design, transportation, security, and sanitation all influence access to cooling and healthcare during an event.
This new package features systematic reviews, an implementation manual, and a specialized heat-risk assessment tool. It also offers resources for creating evidence-based public messages during periods of elevated heat. The assessment tool allows for structured and repeatable evaluations both before and during an event. The overarching framework encompasses preparation, impact mitigation, and recovery stages. Organizers can incorporate these measures alongside existing emergency protocols, occupational safety standards, and national heat-health action plans.
Research underscores the importance of early heat precaution measures
The Intergovernmental Panel on Climate Change has observed that extreme heat events have become more frequent and intense across most land regions since the 1950s. Rising temperatures pose additional health challenges during large outdoor or crowded gatherings. Vulnerable groups such as older adults, individuals with chronic health conditions, and those engaged in physical activity are at higher risk. Workers and volunteers who spend long hours outside in support roles may also face increased dangers.
The guidance considers heat management as a vital component of broader public health and emergency preparedness for mass events. It urges authorities and organizers to assess conditions continually during the entire event cycle. Coordination between health protection efforts and operational planning is essential. The recommended measures are applicable to various gathering types and sizes, including international sports competitions, festivals, and religious occasions. Emphasizing prevention, early intervention, and on-site care, the framework supports existing national systems for heat-related health management, emergency response, and clinical treatment.