But our UV Index is up into the extreme levels. The World Health Organization has rated the Ultra-Violet levels and given a scale of “minutes to skin damage” to correspond with these levels. Check the index here: UV Index | SunWise | US EPA.
Today the risk to skin damage is under 10 minutes of exposure at noon.
In a related story, frogs evolved a black cap on their eggs to protect them from damaging UV rays, this when the Earth’s atmosphere was young and still thin.