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AI-DRAFTED — PHYSICIAN REVIEW IN PROGRESSThe citation for this entry was checked against Crossref and PubMed, but its summary and interpretation were drafted by an AI model from the published abstract and have not yet been individually read by a physician. Read the linked source before relying on this operationally.
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Risk of heat-related illnesses and preventive measures at mass gathering rock festivals in the summer of 2023 in Japan[1]

Takeda A, Seino K, Shimonosono K, Tomio J · 2026 · Environ Health Prev Med

Summary

Analysis of four July-August 2023 Japanese rock festivals pairing daily maximum WBGT from the nearest meteorological stations with each festival's public heat-risk communication and regional emergency heat-illness transport data. Three festivals hit the Japanese "Danger" WBGT threshold (>=31 C) and one the "Severe Warning" band (28-31 C) — yet two of the Danger-level festivals issued NO heat advisory on their websites; one gave basic advice; only one deployed comprehensive countermeasures (public warnings, hats/towels/portable-fan recommendations). Regional emergency heat transports rose around two of the festivals. Concludes risk communication and preventive measures were inconsistent relative to measured risk.

So what

A natural experiment in the gap between measured heat risk and organizer behavior: festivals running at Danger-level WBGT communicated nothing, and the regions around them paid in emergency transports. The method — public WBGT + public event communications + ambulance data — is a replicable accountability audit any jurisdiction could run, and the finding gives MGMI's weather pages their sharpest line: heat-risk communication is a medical countermeasure, currently applied at organizer discretion. Pairs with the Purple Guide weather chapter's forecast-specification duty and Delgado's risk-communication gap.

Key findings

  • 4 Japanese rock festivals, summer 2023: 3 at WBGT Danger (>=31 C), 1 at Severe Warning
  • Two Danger-level festivals issued NO public heat advisory
  • Regional emergency heat-illness transports rose around 2 festivals
  • Only 1 festival deployed comprehensive countermeasures
  • Replicable audit method: public WBGT + event comms + transport data; free PMC

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