What weather is the strongest UV rays?

Ultraviolet intensity is divided into 5 levels: level 1 is the weakest, usually showing rain; level 2 is weak, usually showing cloudy weather; level 3 is medium, usually showing cloudy weather, and occasionally cloudy weather. A little sun is seen in the clouds; level 4 is strong, usually showing sunny weather; level 5 is the strongest, usually showing sunny weather.

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