According to the Ultraviolet Index of Risk for Skin Damage and Sun Protection Behaviors,an ultraviolet index of 4 is considered

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An ultraviolet index of 4 is considered moderate risk for skin damage and sun protection behaviors, according to the Ultraviolet Index of Risk for Skin Damage and Sun Protection Behaviors. This means that precautionary measures such as seeking shade, wearing protective clothing, and using sunscreen are recommended.