Yet, Constible said, "the research has kept piling up that heat is not only potentially deadly to workers, but also drastically affects their productivity – billions of work hours lost in the U.S. and around the world because it's too darn hot."

The probability of work-related accidents rises by nearly 6% when temperatures pass 90 degrees Fahrenheit (32 degrees Celsius), according to research from the Workers Compensation Research Institute published in May.

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