The table below gives an indication of the importance of the different UV indices:

UV-Index Evaluation Protection
0 – 2 low No protection required
3 – 5 moderate Protection required: hat, T-shirt, sunglasses, sunscreen
6 – 7 high Protection required: hat, T-shirt, sunglasses, sunscreen
8 – 10 very high additional protection required: avoid staying outside if possible
≥ 11 extreme additional protection required: avoid staying outside if possible
Source: Schweizerisches Bundesamt für Gesundheit