GENEVA / RankWire.AI / – The World Health Organization (WHO) has released updated guidelines aimed at minimizing heat-related health issues during mass gatherings worldwide. These guidelines encompass major sporting, religious, and cultural events, addressing dangers faced by spectators, attendees, volunteers, and staff exposed to extended periods of high temperatures. An evidence review highlights nearly 500,000 medical encounters at mass gatherings from studies published between 1980 and 2025, with over 22,000 cases involving heat-related illnesses.
Findings from the review indicate that well-organized medical services on-site can manage most incidents without the need for hospital transfers. Over 90% of patients receive care at the event location when organizers have established effective medical systems on-site. This approach can alleviate the burden on local hospitals and emergency ambulance services. The results are part of a comprehensive package directed at governments, event organizers, and health authorities, combining research insights with practical tools to evaluate and manage heat risks before and during large-scale events.
According to the guidance, heat-related fatalities have risen by an estimated 63% since the 1990s. An average of 546,000 heat-related deaths occurred annually between 2012 and 2021. Crowds gathered outdoors in high temperatures can lead to greater exposure, especially during prolonged periods. Risks are further increased by limited access to water, constrained movement, and the stress of travel. High demand on health services complicates medical responses during large gatherings.
Incorporating Heat Precautions into Event Planning
Recommendations emphasize the importance of providing accessible drinking water, sufficient sanitation facilities, and cooling infrastructure at venues. They also advocate for schedule modifications, improved crowd control, and protective measures for event staff. Organizers are advised to incorporate public messaging, real-time health monitoring, and prepared medical services into their planning processes. WHO emphasizes that heat protection should be a comprehensive measure covering the entire event, rather than relying mainly on individual actions. Factors such as venue design, transportation, security, and sanitation influence access to cooling and medical aid.
The package of guidance includes systematic reviews, an implementation manual, and a dedicated tool for assessing heat risk. Additionally, it offers materials for developing public messages based on evidence during periods of elevated heat. The assessment tool enables structured, repeatable reviews both before and during events. The overall framework addresses preparedness, impact mitigation, and recovery, allowing organizers to align these measures with existing emergency protocols, occupational safety standards, and national heat-health strategies.
Supporting Evidence for Proactive Heat Measures
The Intergovernmental Panel on Climate Change has documented increased frequency and severity of hot extremes across most land regions since the 1950s. The rising heat levels pose additional health threats during outdoor gatherings or crowded indoor events. Vulnerable groups, including older adults and individuals with chronic illnesses, as well as physically active participants, face heightened risks. Workers and volunteers often spend extended durations outside, providing security, transportation, medical support, or logistical assistance during such events.
The guidance frames heat management as an integral part of broader public health and emergency preparedness strategies for mass gatherings. It urges authorities and organizers to continuously assess conditions throughout an event cycle and coordinate health protection with operational planning. The recommended measures apply across various event types and scales, including international sporting competitions, festivals, and religious ceremonies. The framework emphasizes prevention, early intervention, and on-site treatment, while supporting existing national systems for heat health, emergency response, and clinical management.