The UV index(UVI)is a measure ofthe highestsunburneffectiveirradiance,which is causedby thesun during the day.TheUVIdepends primarily on theposition of the sunas well as on thecloudsandthe altitudeof a place.Light cloudshardlyreduce theUVI.However, specialcloudforms may alsolead to ashort-termincreaseof theUVI.Evensnow,waterandbrightsandsurfacescancauseexposure to radiationhigher than thepredictedmaximumUVI.The reason isthat the UVradiation is reflectedtolight orreflective surfaces.
It is internationally established that theUVIshould be quotedinwholenumbers from 1 to10.Even highervaluesare designated by11+.Within thisscalefollowingevaluation standardsandprotectionrecommendations apply:
|UV index||rating||protective measures|
|0-2||low||No protection needed|
|3-5||moderate||Protection Required (Shadow, T-shirt, sunscreen, hat)|
|6-7||high||Protection Required (Shadow, T-shirt, sunscreen, hat)|
|8-10||Very High||urgent protection required(avoid staying outdoors if possible)|
|11+||Extreme||urgent protection required (avoid staying outdoors if possible)|
The UVI values for Berlin were provided by an institution 60km southeast of the city. The company sglux SolGel Technologies GmbH wanted to change this situation and since 2014 operates Berlin's first UV index observation station on the roof of the company's building. The current values of the station will be redirected to the company's website and on the website of Advanced UV for Life.
The following charts show the current daily values and the values of the previous day as part of the internationally agreed scale of 1-10.