WBGT includes which of the following components?

• A. Humidity and dust concentration.
• B. Temperature and humidity.
• C. Temperature, humidity, wind, and radiant heat.
• D. Wind and noise level.

Answer: (C)

WBGT estimates how hot it feels by combining how hot the air is, how humidity affects cooling, how wind changes evaporative cooling, and how radiant heat from the sun and surroundings adds heat load. To capture these factors, it uses three measurements: dry-bulb temperature for air temperature, wet-bulb temperature reflecting humidity and wind-driven evaporation, and globe temperature representing radiant heat. Wind influences evaporative cooling captured by the wet-bulb reading, while radiant heat is captured by the globe temperature, so the index inherently includes wind and radiant heat along with temperature and humidity. Dust concentration or noise aren’t part of WBGT, whereas temperature, humidity, wind, and radiant heat are central to it.