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What is the WBGT heatstroke index?
Of the various recommended temperature indexes to evaluate high-temperature environments, the WBGT (wet-bulb globe temperature) is the most commonly used to prevent heatstroke during work or exercise. WBGT was first proposed by Yaglou and Minard (USA) in 1957. Dry-bulb, wet-bulb, and black-bulb temperatures are calculated as follows.

Source: “Heatstroke and Health Guidance Manual (June 2007 Edition)” (Ministry of the Environment)

WBGT = 0.7 × Wet-bulb temperature + 0.2 × Globe temperature + 0.1 × Dry-bulb temperature (Outdoors with solar radiation)
WBGT = 0.7 × Wet-bulb temperature + 0.3 × Globe temperature (Indoors with negligible solar radiation)
This project uses the WBGT calculated for outdoors with sun exposure to prevent heatstroke for outdoor activities, exercise, and work.