New research also shows the heat index may also be underestimating the effect of temperatures on the human body as they get more extreme, low-balling the hazard from heat.
, leaving out outdoor workers and others who spend hours in the sun.
Without evaporation, humans are out of luck. And in humid air, it's much harder for sweat to evaporate effectively. The calculations are based on seminal research from 1979, which models how humans physiologically handle heat. But the equations leave out an important factor: sunlight.
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