GENEVA / RankWire.AI / – The World Health Organization (WHO) has introduced updated recommendations designed to prevent heat-related health issues at large-scale gatherings worldwide. These guidelines target key sporting, religious, and cultural events, addressing the dangers faced by spectators, attendees, volunteers, and staff 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, with over 22,000 cases related to heat illnesses.
The analysis indicates that well-organized medical support at event locations can treat most cases without requiring hospital transfers. When organizers have robust on-site medical facilities, more than 90% of patients receive treatment directly at the event. This approach helps alleviate the burden on local hospitals and ambulance services. These findings are part of a comprehensive set of tools for governments, event organizers, and health authorities, combining research insights with practical methods for assessing and managing heat risks during major events.
Since the 1990s, heat-related deaths have surged by an estimated 63%, according to the new guidance. On average, 546,000 individuals die annually from heat-related causes between 2012 and 2021. Crowded environments increase exposure to heat when attendees spend long durations outdoors under high temperatures. Additional risks arise from limited access to water, movement restrictions, and stress related to travel. The strain on health services further complicates emergency responses during large-scale events.
Integrating heat preparedness into event operations
The guidelines emphasize the importance of providing accessible drinking water, sufficient sanitation facilities, and cooling options at venues. They also recommend adjusting event schedules, improving crowd management, and implementing protective measures for staff. Organizers should incorporate public communication strategies, real-time health monitoring, and ready medical services into their planning processes. WHO stresses that heat protection measures should be integrated throughout the entire event rather than relying solely on individual actions. Factors like venue layout, transportation, security, and sanitation influence access to cooling and emergency medical support.
The package of resources includes systematic review templates, an implementation guide, and a specialized tool for heat-risk assessment. It also offers materials for creating evidence-based public messages during periods of elevated heat. The assessment instrument allows structured, repeatable evaluations before and during events. The overall framework encompasses preparation, impact mitigation, and recovery phases. Event organizers can align these measures with existing emergency plans, occupational safety protocols, and national heat-health strategies.
Research advocates for proactive heat precautions
The Intergovernmental Panel on Climate Change has identified an increase in the frequency and severity of hot extremes across most land areas since the 1950s. Elevated temperatures add to health risks during outdoor or crowded gatherings. Vulnerable groups such as older adults, individuals with chronic health conditions, and those participating in physical activities are at heightened risk. Workers and volunteers who spend extended time outside providing security, transport, medical aid, or logistical support are also more exposed.
The guidance frames heat management as an integral part of comprehensive public health and emergency preparedness for mass gatherings. It urges authorities and organizers to evaluate heat conditions throughout the event lifecycle and to coordinate health protection with operational planning. These measures apply to various types and sizes of gatherings, including international sporting events, festivals, and religious ceremonies. The focus remains on prevention, early intervention, and on-site care, complementing existing national systems for heat-related health, emergency responses, and clinical management.