What does WBGT stand for in heat stress assessment?

• A. Work-Based Global Temperature.
• B. Winter-Bulb Grade Temperature.
• C. Wet-Bulb Globe Temperature.
• D. Water-Borne Thermal Gradient.

Answer: (C)

WBGT stands for Wet-Bulb Globe Temperature, a practical heat-stress index used in occupational hygiene to estimate the risk of heat strain. It reflects how hot it feels by combining three measurements: the wet-bulb temperature, which indicates the cooling potential of evaporation and humidity; the globe temperature, which captures radiant heat from sunlight and surrounding surfaces; and the dry-bulb air temperature, which represents the ambient air. By weighting these factors, WBGT provides a single value that accounts for humidity, air movement, and radiant heat, giving a better sense of the body's heat load than air temperature alone. This index is used to set work-rest schedules, hydration, and protective measures in hot environments and is usually measured with a device that integrates all three sensors. The other term options are not standard in heat-stress assessment.