Q3 Innovations UV HAWK - Manual (Page 8)

Understanding the Results
The unit displays its UV measurement in the Ultraviolet Index (UVI)
Scale. The UVI, developed by the World Health Organization (WHO), is
described as follows:
The UVI is a simple measure of the UV radiation level at the Earth’s
surface. It has been designed to indicate the potential for adverse health
effects and to encourage people to protect themselves. The values of the
Index range from zero upward and the higher the index value, the greater
the potential for damage to the skin and eye, and the less time it takes
for harm to occur.
While the levels of UV radiation vary during the day, they reach a
maximum around mid-day. The UVI is usually presented as a forecast
of the maximum amount of UV radiation expected to reach the Earth’s
surface at solar noon. In countries close to the equator, the UVI can reach
up to 20. Summer-time values in Northern latitudes rarely exceed 8.1
1. www.who.int
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