WBGT is used for what purpose?

• A. Heat stress surveys
• B. Humidity control
• C. Wind speed measurement
• D. Engine efficiency

Answer: (A)

WBGT, or Wet-Bulb Globe Temperature, is a measure used to estimate heat stress and the risk of heat-related illness for people in hot environments. It combines dry-bulb temperature, humidity (via the wet-bulb temperature), radiant heat (via the globe thermometer), and wind speed to reflect how hot it feels to the human body, including how quickly sweat can evaporate and how much radiant heat is absorbed.

Because of this, WBGT is used in heat stress surveys to assess environmental risk and to plan protective actions such as work-rest cycles, hydration strategies, and appropriate PPE. It isn’t a method for controlling humidity, it doesn’t measure wind speed by itself, and it isn’t related to engine efficiency.