UV TrackerUV and sun safety, explained
How the UV index works, what your skin type means for it, and the numbers behind "safe sun time" — with the sources cited on every page.
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Safe sun time by skin type and UV level
Full tables for Fitzpatrick types I–VI at every UV index, and the formula behind them.
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Safe sun time calculator
Pick your skin type and today's UV index for an instant estimate, with sunscreen.
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The UV index scale, explained
What the UV index measures, the WHO bands, and what each level means for you.
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The six Fitzpatrick skin types
How the scale works, how your type is assessed, and where ITA° and Monk fit in.
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How UV Tracker measures UV and your skin type
The methodology behind the sky scan and the skin photo, and what stays on your device.
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Does UV change with clouds, shade and altitude?
What clouds, shade, water, sand, snow and altitude do to your real UV exposure.
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SPF, explained: what sunscreen really does
What the SPF number means, and why most people get far less protection than the label says.
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The best (and riskiest) hours for sun
UV peaks around solar noon, not the hottest hour — plus the shadow rule.
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Sunlight, vitamin D and safe sun time
How little sun it actually takes, and why more isn't more.
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Sun safety for children and babies
Shade rules for babies, sunscreen ages, clothing and school-hours timing.
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UV in Vietnam and Southeast Asia
Why UV runs high year-round, and practical protection suited to the climate.