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1. www.webmd.com › skin-problems-and-treatments › uv-index-overviewThe UV Index Explained - WebMD

   www.webmd.com › skin-problems-and-treatments › uv-index-overview

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   2024年2月12日 · The ultraviolet (UV) index is a number on a scale from 1-11+ that tells you how intense the UV rays from the sun are predicted to be at a particular time and place. It's useful because, while you ...