UV Index Guide
UV Index (0–11+)
Skin Type
The UV Index is an international standard measuring ultraviolet radiation intensity from the sun, ranging from 0 (no UV) to 11+ (extreme). It was developed by Canadian scientists in 1992 and adopted by the WHO.
- 1UV Index calculated from satellite data weighted by erythema action spectrum
- 2Higher altitude, lower latitude, and summer months all increase UV Index
- 3Safe exposure time varies by Fitzpatrick skin type I through VI
- 4SPF rating of sunscreen directly reduces the UV dose reaching skin
UV Index 3, Fitzpatrick skin type II=Wear SPF 30+, approximately 50 minutes safe exposure
UV Index 8, Fitzpatrick skin type I=Full protection required, only about 12 minutes safe
UV Index 11 or higher=Avoid outdoor midday exposure, SPF 50+ essential
| UV Index | Level | Recommended SPF | Action |
|---|---|---|---|
| 0–2 | Low | SPF 15 | Minimal protection needed |
| 3–5 | Moderate | SPF 30 | Cover up, wear sunglasses |
| 6–7 | High | SPF 30–50 | Hat and shade at midday |
| 8–10 | Very High | SPF 50+ | Extra protection essential |
| 11+ | Extreme | SPF 50+ reapply | Avoid outdoor midday |
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