Is there ultraviolet light on cloudy days?

1, there are ultraviolet rays on cloudy days, but the intensity is not too great, so you can not prevent them, but sometimes you should prevent them on cloudy days in summer.

2. The ultraviolet intensity is divided into five levels: 1 level is the weakest, which usually indicates rain; Level 2 is weak and generally cloudy; Level 3 is medium, generally cloudy, and occasionally a little sun can be seen from the clouds; Level 4 is strong, generally sunny; Level 5 is the strongest, usually showing particularly sunny weather. The ultraviolet content on cloudy days is as high as 90% on sunny days.

3. Whether sun protection measures are needed should be judged by ultraviolet index, not by sunny and cloudy days. The ultraviolet index is generally expressed as 0- 15. Generally speaking, the ultraviolet index at night is 0, and it is strongest in tropical or plateau areas when there are no clouds on sunny days, with an index of 15. It can be seen that the greater the ultraviolet index value, the greater the harm of ultraviolet radiation to human body, and the greater the harm to skin in a short time.