What weather has the strongest ultraviolet rays?

The ultraviolet intensity is divided into 5 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, which usually means that the weather is particularly sunny.

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