Heat waves are lasting longer, becoming more frequent and getting just plain hotter. One question a lot of people are asking is: “When will it get too hot for normal daily activity as we know it, even for young, healthy adults?'
The following essay is reprinted with permission from The Conversation, an online publication covering the latest research.
People often point to a study published in 2010 that estimated that a wet-bulb temperature of 35 C – equal to 95 F at 100% humidity, or 115 F at 50% humidity – would be the upper limit of safety, beyond which the human body can no longer cool itself by evaporating sweat from the surface of the body to maintain a stable body core temperature.
Each participant swallowed a small telemetry pill, which monitored their deep body or core temperature. They then sat in an environmental chamber, moving just enough to simulate the minimal activities of daily living, such as cooking and eating. Researchers slowly increased either the temperature in the chamber or the humidity and monitored when the subject’s core temperature started to rise.
Dry vs. humid environments Current heat waves around the globe are approaching, if not exceeding, these limits.
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