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While technically there is no way to directly compare WBGT and humidex values, this humidex response plan provides an additional guideline that uses information that is easily available to most employers. This plan was developed as a tool to help workplaces as most find using the WBGT complicated and expensive. (OHCOW) created a humidex-based response plan that translated the TLVs® WBGTs into humidex values and developed recommended responses for each humidex range. The Occupational Health Clinics for Ontario Workers Inc. Hot Environments - Health Effects and First Aid.A high humidex rating can serve as a cue to assess workplace conditions more precisely.įor more information, please see the OSH Answers fact sheets on: Workplaces must use caution when applying the humidex rating. The relation between humidex and comfort is subjective. In hot, humid conditions, there is a considerable risk of heat stroke and sunstroke." If working outdoors is an absolute necessity, drink plenty of liquids and take frequent rest breaks. If the reading is in the mid to high 30s, then you should tone down or modify certain types of outdoor exercise, depending on the individual age and health, physical shape, the type of clothes worn and other weather conditions. In such conditions, you should reduce all unnecessary physical activity. "An extremely high Humidex reading is any reading over 40. See the humidex table from Governemnt of Canada for a guide to humidex in compaison to termperature and humidity. This level is considered a level of "great discomfort" and exertion should be avoided. For example, if the temperature is 30☌ and the relative humidity is 70%, the humidex rating is 41. If you know the temperature and relative humidity, the following chart can be used to determine the humidex rating. Sweating is not a good symptom of heat stress as there are two types of heat stroke – "classical" where there is little or no sweating (usually occurs in children, persons who are chronically ill, and the elderly), and "exertional" where body temperature rises because of strenuous exercise or work and sweating is usually present.Ĭan workplaces use humidex to monitor conditions that may result in heat-related illness?

Complete or partial loss of consciousness is possible.

The body temperature becomes very high (even exceeding 41☌).

Heat stroke is the most serious condition and requires immediate medical attention. Symptoms include profuse sweating, weakness, dizziness, nausea, and headaches. Heat exhaustion results when the body loses large amounts of fluid by sweating during work in hot environments. The spasms are caused by the failure of the body to replace its lost body salts and usually occur after heavy sweating. The muscles used in doing the work are most susceptible. Heat cramps are painful spasms of the muscles. This painful rash reduces the body's ability to sweat and to tolerate heat. Heat rash, or prickly heat, occurs when blocked sweat glands become inflamed. There are several common heat-related illnesses.