As the days get longer and warmer our venture into the sunlight increases. Before leaving your indoors, those sun glasses best be put on and that exposed skin be protected with sun blocker lotion.
Electromagnetic radiation comes in many forms.
The most familiar is visible light. Generally a great deal of ultraviolet radiation is absorbed by the water vapor of the atmosphere and even more by smoke and dust particles. From October to February, above the central North American latitudes, the ultraviolet content of sunshine is at its lowest. Surprisingly, there is a relatively higher amount of ultraviolet in the skyshine than in direct sunshine. The ocean, sandy beaches and snow can furnish a diffuse and, at times, a very powerful form of sunlight.