WHO标准
紫外线指数范围解读
紫外线指数范围从0（无风险）到11+（极端）。本页面将逐步详细阐述整个等级 — 每个级别的含义、白皙皮肤晒伤的速度、所需的防护措施，以及世界上哪些地区通常处于这些数值。
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