An example of the threshold at which the human body is no longer able to cool itself and begins to overheat is a humidity level of 50% and a high heat of 46 °C (115 °F), as this would indicate a wet-bulb temperature of 35 °C (95 °F).
Healthy humans in the shade could perish in six hours at this wet bulb temperature.
https://www.theguardian.com/environment/2017/aug/02/climate-change-to-cause-humid-heatwaves-that-will-kill-even-healthy-people
https://en.wikipedia.org/wiki/Wet-bulb_temperature
https://www.easycalculation.com/weather/dewpoint-wetbulb-calculator.php
http://w1.weather.gov/data/obhistory/KSAC.html
https://www.theguardian.com/environment/2017/sep/09/this-is-how-your-world-could-end-climate-change-global-warming
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