The heat index does not account for the effects of wind, sunlight, radiant heat sources, or workload. It is measured in the shade and combines air temperature and relative humidity to represent how hot the conditions feel at rest. Heat Index is another common way to measure heat stress. In contrast, standard thermometers only assess one factor (air temperature). One major advantage is that WBGT accounts for all four major environmental heat factors - temperature, humidity, radiant heat, and wind. WBGT has important advantages over other environmental heat measurements. Employers should always follow the WBGT manufacturer's instructions about setup, calibration, and use. For example, if the work is in direct sunlight, then the WBGT instrument should be in the sun. The WBGT instrument should be placed close to the work location. A black globe thermometer to measure radiant heat.A natural wet bulb thermometer to measure the potential for evaporative cooling. ![]()
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