ArticleEnvironment & health (Washington, D.C.)2026
Determining Location-Specific Thresholds for Heat Warning Systems to Mitigate Heatstroke Mortality in Japan.
Article in Environment & health (Washington, D.C.), 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 1 paper.
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1 citing paper in PubMed.
- Insights from a workshop on climate-resilience in health systems in Japan and Germany: strategies to counteract social isolation and heat health risks for older adults.Environmental health and preventive medicine · 2026Article
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7 authors.
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Abstract
The current nationwide wet bulb globe temperature (WBGT) threshold (33 °C) of Japan's heat warning system (HWS) does not adequately account for regional variations in heat sensitivity and heatstroke mortality. In this study, we aimed to determine the critical WBGT threshold for effectively mitigating preventable heatstroke mortality across Japan. To this end, daily heatstroke mortality data (ICD-10: X30; 2010-2019) for all 47 prefectures of Japan were analyzed using a time-stratified case-crossover design based on a conditional quasi-Poisson regression combined with a distributed lag nonlinear model. Assuming that heatstroke mortality is preventable via interventions when prompted by Japan's HWS, the WBGT threshold required to reduce 50% of preventable heatstroke mortalities ("target50") was estimated; subgroup analyses by age, sex, and summer phase were also conducted. According to the results, 9702 heatstroke mortalities were recorded during the study period, with more cases observed in late summer and among older individuals. Further, the current HWS threshold (WBGT
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