TEMPERATURE AND HUMIDITY INDEX
A useful guide to summertime comfort is the Temperature-Humidity Index
(THI). This table gives an approximation of how most people react to heat and
humidity. To use the table, find out the temperature and relative humidity of
the work area. Start at the temperature listed on the left, and read across to
the number under the relative humidity level (round up to the higher
percentage). This number is the temperature-humidity index. The values are for
people wearing the right amount of clothing doing light work, with very little
wind.
The lightly highlighted area is uncomfortable for everyone. For moderate to heavy activity, workers should be concerned about heat stress and should alternate time working in the heat and time in cooler areas or light work. When the THI is in the darkly highlighted area, extreme caution is indicated. Workers should try to schedule work to allow only 25% of time performing heavy work in such an environment. Workers should be encouraged to drink plenty of fluids and be on the lookout for signs of heat stress.
The lightly highlighted area is uncomfortable for everyone. For moderate to heavy activity, workers should be concerned about heat stress and should alternate time working in the heat and time in cooler areas or light work. When the THI is in the darkly highlighted area, extreme caution is indicated. Workers should try to schedule work to allow only 25% of time performing heavy work in such an environment. Workers should be encouraged to drink plenty of fluids and be on the lookout for signs of heat stress.
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