(UV) radiation at a particular place and time.
The purpose of the UV Index is to help people
effectively protect themselves from UV
radiation. The UV Index is a linear scale, with
higher values representing a greater risk of
sunburn (which is correlated with other health
risks) due to UV exposure. An index of 0
corresponds to zero UV radiation, as is
essentially the case at night. An index of 10
corresponds roughly to midday summer
sunlight with a clear sky when the UV Index
was originally designed, but values above 10
are sometimes possible. Levels above 8 are
considered “very high” and above 11 are
considered “extreme.”
Wind chill (popularly wind chill factor) is the
lowering of body temperature due to the
passing-flow of lower-temperature air. In
other words, the air “feels” colder than it is
because of the chilling effect of the wind on
the skin.
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