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Objectives: The objective of this study was to assess heat stress, compare heat stress indices, and evaluate theusefulness of wet bulb globe temperature (WBGT) among outdoor workers exposed to heat during the summerseason. Methods: WBGT, dry temperature, and heat index were measured using WBGT measurers (QUESTemp 32model and QUESTemp 34 model, QUEST, WI, USA) by industrial hygienists from August 27 to September 16,2015. Heat stress indices were measured at the workplaces of a shipbuilder in Ulsan and a construction site inDaegu. The dry temperature observed by the Automated Synoptic Observing System (ASOS) of the KoreaMeteorological Administration was also compared. Results: Dry temperature measured by WBGT is different from that by ASOS. The temperature obtained fromASOS was less than 33℃ , above which point a heat wave is forecast by the Korea Meteorological Administration. A heat index above 32.8℃ as a moderate risk was not observed during measurement. WBGT was consistentlyhigher than 22℃ , above which the risk of heat-related illness is increased in unacclimated workers involved inwork with a high metabolic rate. WBGT was sometimes higher than 28℃ , above which the risk of heat-relatedillness is increased in acclimated workers involved in work with a moderate metabolic rate in September. Conclusion: According to the measurement of heat stress indices, WBGT was more sensitive than heat indexand temperature. Thus, general measures to prevent heat-related diseases should be implemented in workplacesduring the summer season according to WBGT.

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