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Ultraviolet (UV) Index Scale

Ultraviolet (UV) Index Scale – The UV index, which was developed by the National Weather Service (NWS) and Environmental Protection Agency (EPA), predicts the next day’s ultraviolet radiation levels on a scale of 1-11+ . The scale helps people decide about their behaviors to protect themselves from too much sun. Normally, the ozone layer shields the Earth from harmful Ultraviolet (UV) rays. The level of radiation that reaches the Earth varies depending on the amount of ozone depletion as well as variations in seasons and weather conditions.

 

The EPA issues a UV Alert when the level of solar UV radiation is predicted to be unusually high, and as a result, the risk of overexposure to UV rays is greater. The UV Index Scale is consistent with the scale used by the World Health Organization. The following table summarizes the UV levels.

 

                                    UV (Utra Violet) Index Table

 

                                    UV Level           UV Meaning

 

                                    2 or less           Low risk

 

                                    3, 4, and 5        Moderate risk

 

                                    6 to 7                High risk from unprotected                                                             sun exposure. Therefore                                                               sunscreen should be used                                                             with a SPK (sun protective                                                             factor) of at least 15, and                                                             one should wear a wide                                                                 brim hat and UV                                                                           protective sunglasses

                                    8 to 10              Very high risk of harm                                                                   from unprotected sun                                                                   exposure.

                                    11 or higher       Extreme risk of harm.

Information on protecting ones self from UV rays is provided in our Preventive Health Channel.

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