The UV index is a measure of the UV radiation level at the Earth’s surface at solar noon. It  indicates the UV adverse health effects and advises people to protect themselves. The values of the Index range from zero; at the equator the UVI can reach up to 20. Summer-time values in Northern latitudes rarely exceed 8. It was pubblished in 1995 through an international effort by WHO in collaboration with the United Nations Environment Programme (UNEP), the World Meteorological Organization (WMO), the International Commission on Non-Ionizing Radiation Protection (ICNIRP), and the German Federal Office for Radiation Protection.

Read more in WHO website

From Meteofocus

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