Six major heat stress indices are evaluated through this paper by the efficiencies at predicting workers' safety behavior. Actual temperature and safety sampling data were taken in two industrial plants for a five month period (July through November). Those data were converted to computer and analyzed in different models. HSI (Heat Stress Index) appears to be the best predictor because of its including the factor of metabolic work load. NET (New Effective Temperature) seems to be the best one among the pure thermal indices. WBGT (Wet Bulb Globe Temperature) and DB (Dry Bulb Temperature) are two easily obtained thermal indices for predicting human safety behaviors.
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