WHO Warns Fans Are Dangerous Above 40°C Amid Heatwave

As record-breaking heatwaves grip South Korea, with temperatures soaring above 40 degrees Celsius in some regions, the World Health Organization (WHO) has issued critical guidance on surviving extreme heat. The WHO warns that using electric fans when ambient temperatures surpass 40°C can be dangerous, potentially increasing the risk of heat-related illnesses.

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When the body's ability to regulate its temperature decreases and to remove accumulated heat from the body, the risk of heat exhaustion and heatstroke increases.

During periods of intense heat, the body's natural thermoregulation mechanisms become overwhelmed. The WHO explains that when the body struggles to dissipate heat, the risk of heat exhaustion and heatstroke escalates significantly. This strain can also place undue pressure on the heart and kidneys, exacerbating existing chronic conditions such as cardiovascular, mental health, respiratory, and diabetes-related illnesses, and potentially leading to acute kidney injury.

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As a result, extreme heat can worsen the risk of chronic diseases (cardiovascular diseases, mental health diseases, respiratory diseases, diabetes-related diseases) and cause acute kidney injury.

The WHO outlines four key categories of protective measures: avoiding heat, maintaining cool indoor environments, keeping the body cool with adequate hydration, and protecting vulnerable populations. They recommend staying in the shade, as the perceived temperature can be 10-15 degrees higher in direct sunlight. To keep homes cool, it's advised to close windows and use blinds during the day if outdoor temperatures exceed indoor levels.

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In the shade, the perceived temperature can be 10 to 15 degrees higher than the actual temperature.

For personal cooling, the WHO suggests using fans only when temperatures are below 40°C. Above this threshold, fans may inadvertently raise body temperature. They recommend setting air conditioners to 27°C and using fans in conjunction to save energy and enhance cooling. Crucially, the WHO stresses the importance of regular fluid intake, advising about one cup per hour, totaling at least 2-3 liters daily. They also urge extreme caution regarding children and pets in parked vehicles, as interior temperatures can rise to dangerous levels rapidly. For infants, covering strollers with wet, thin cloths instead of dry ones can help mitigate heat buildup.

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It is best to use a fan only when the temperature is below 40 degrees Celsius.