This editorial refers to ‘Out-of-hospital cardiac arrest attributable to sunshine: a nationwide, retrospective, observational study’, by D. Onozuka and A. Hagihara. 10.1093/ehjqcco/qcw056.

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Out-of-hospital cardiac arrest (OHCA) is characterized by unexpected collapse caused by a cardiac disorder, commonly coronary heart disease. Survival after incident OHCA is as low as 8% and it is often used as a surrogate for sudden cardiac death, a leading global cause of mortality.1 Emerging evidence supports a relationship between OHCA and environmental factors such as extreme weather conditions and air pollution.

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Sudden cardiac deaths occur more often during morning hours, on Mondays, and during winter months.2 The winter peak in sudden cardiac death is often attributed to the seasonal drop in ambient temperature.3 but hot weather may also be important.4–6...

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