It is important to understand how the body handles heat and hot conditions when evaluating the potential for employee heat-related illnesses. As temperatures rise, the body releases heat more slowly. As humidity increases, sweat evaporation decreases and stagnant air makes sweat evaporation even more difficult. When these three factors are combined, you have a higher potential for health and safety concerns. The chances for accidents due to sweaty hands, dizziness and decreased mental alertness go up considerably.