Which of the following is not a component of the WBGT outdoor calculation?

• A. Relative Humidity
• B. Wet Bulb
• C. Globe Temperature
• D. Dry Bulb

Answer: (A)

WBGT is a heat-stress index that combines three measurements to reflect air temperature, radiant heat, and evaporative cooling: dry-bulb temperature (ambient air), wet-bulb temperature (evaporation effect), and globe temperature (radiant heat). Humidity doesn’t appear as its own term in the standard outdoor WBGT formula; instead, humidity influences the wet-bulb reading, which carries the evaporative effect into the calculation. The typical outdoor formula weights these three components to produce a single index, so the one not directly used as a separate component is Relative Humidity.