Is ultraviolet rays stronger on cloudy days? Is ultraviolet rays stronger on cloudy days than on sunny days?

Ultraviolet rays are strong on cloudy days. The content of ultraviolet rays on cloudy days is as high as 90% of that on sunny days. The intensity of ultraviolet rays is divided into 5 levels: Level 1 is the weakest, usually with rain; Level 2 is weak, usually with cloudy weather; Level 3 is medium, usually with cloudy weather, and occasionally a bit of the sun can be seen from the clouds; Level 4 is stronger Strong, usually manifested as sunny weather; Level 5 is the strongest, usually manifested as particularly sunny weather.

April to September is the season with the strongest ultraviolet exposure. 10 am to 2 pm is the period with the strongest ultraviolet exposure, and noon is the peak of ultraviolet exposure. When ultraviolet rays irradiate the human body, it can promote the body's synthesis of vitamin D. This is why children are often allowed to bask in the sun. Ultraviolet rays also have a bactericidal effect, and ultraviolet rays are used to disinfect wards in hospitals. However, excessive ultraviolet rays can harm the human body, so you should pay attention to protection.