Cancer Society prevention policy lead Emma Shields said it was alarming to see teenagers on TikTok promoting the UV Index (UVI) as a tanning guide. The UVI shown on weather and forecasting apps is ...

The ultraviolet index (UVI) is a measure of the level of UV radiation. UVI 3 is the level above which sun protection is recommended by the World Health Organization (WHO).

The UV Index (or UVI) is a standard international measure of ultraviolet radiation emitted by the sun which penetrates the Earth's atmosphere and can cause sunburn. Index values start at zero and ...