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Objectives: Outdoor workers are exposed to thermally stressful work environments. In this study, heat stressindices for harbor workers in summer were calculated to evaluate thermal comfort based on a human heatbalance model. These indices are Physiological Subjective Temperature (PST), Dehydration Risk (DhR), andOverheating Risk (OhR) according to respective stage of cargo work in a harbor. In addition, we constructed aforecast system to provide heat stress information. Methods: Thermophysiological indices in this study were calculated using the MENEX model (i.e. the humanheat balance model), which used as inputs the meteorological parameters, clothing insulation, and metabolic ratefor each stage of cargo work in the harbor of Masan over the course of seven days, including a four-day heat wave. The forecast heat stress information constructed for Masan harbor was based on meteorological data supported bythe Dong-Nae Forecast from the KMA (Korea Metrological Administration) and other input parameters. Results: According to higher metabolic rate, thermophysiological indices showed a critical level. In particular,PST was evaluated as reaching the ‘Very hot’ or ‘Hot’ level during all seven days, despite the heat occurring overonly four. It is important in a regard to consider the work environment conditions (i.e. labor intensity and clothingin harbor). On a webpage, the forecast thermophysiological indices show as infographics to be easily understand. This webpage is comprised of indices for both current conditions and the forecast, with brief guidance. Conclusion: Thermophysiological indices show the risk level to health during a heat wave period. Heat stressinformation could help to protect the health of harbor workers. Further, this study could extend the applicabilityof these indices to a variety of outdoor workers in consideration of work environments.

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