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Environment
W. Larry Kenney, Professor of Physiology, Kinesiology and Human Performance, Penn State

How hot is too hot for the human body? Our lab found heat + humidity gets dangerous faster than many people realize

Long-term exposure to high heat can become lethal. Mark Wilson/Getty Images

Heat waves are becoming supercharged as the climate changes – 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 answer goes beyond the temperature you see on the thermometer. It’s also about humidity. Our research shows the combination of the two can get dangerous faster than scientists previously believed.

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