Penn State researchers found that the maximum wet-bulb temperature humans can endure is lower than previously thought — about 31°C wet-bulb or 87°F at 100% humidity — even for young, healthy subjects. The temperature for older populations, who are more vulnerable to heat, is likely even lower.| www.psu.edu
Scientists use "wet-bulb temperature" to gauge how extreme heat affects the body. But what is it?| Live Science