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The heat index is a measure
of relative discomfort due to the combination
of heat and high humidity. The index was developed
in 1979 and is based on physiological studies
of evaporative skin cooling for various combinations
of ambient (actual) air temperature and humidity.
Heat
index temperatures of 80 F or greater are generally
associated with some discomfort. Heat index
values approaching or exceeding 105 F are considered
life threatening, with severe heat exhaustion
or heat stroke possible if exposure is prolonged
or physical activity is high. Obviously, the
extent of possible heat stress varies with age,
health and other body characteristics.
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