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The wet-bulb globe temperature is a measure of the heat stress in direct sunlight, which takes into account: temperature, humidity, wind speed, sun angle and solar radiation. It is used to determine appropriate exposure levels to high temperatures.
*(28-31℃) means the temperature is greater than or equal to 28 degrees Celsius, and is less than or equal to 31 degrees Celsius. (25-28℃) means the temperature is greater than or equal to 25 degrees Celsius, and is less than or equal to 28 degrees Celsius. (Japanese Society of Biometeorology, Heatstroke prevention in daily life ver.3, 2013)
(Japan Sports Association, Heatstroke prevention during physicical activities, 2013)