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The UV index scale
The UV index measures how strong the sun's burning ultraviolet rays are, on a scale that starts at 0 and has no upper limit. The higher the number, the faster unprotected skin and eyes are damaged. The scale and colors are the same worldwide (World Health Organization); in the United States the forecast is issued by the EPA and the National Weather Service.
| UV index | Level |
|---|---|
| 0–2 | Low Average person chak sun's UV rays chak low danger. Bright days chak sunglasses wear kha. If you burn easily, cover up ani broad-spectrum SPF 30+ sunscreen use kha. Sand, water ani snow chak UV reflect kha ani exposure add kha. |
| 3–5 | Moderate Unprotected sun exposure chak moderate risk. Midday chak shade chak stay kha, when sun is strongest. Protective clothing, wide-brimmed hat ani UV-blocking sunglasses wear kha, ani broad-spectrum SPF 30+ sunscreen every 2 hours apply kha, even cloudy days chak, ani swimming or sweating chak after. |
| 6–7 | High Unprotected sun exposure chak high risk: skin ani eyes chak protection need kha. Middle of the day chak sun chak time reduce kha, shade seek kha, ani protective clothing, wide-brimmed hat, UV-blocking sunglasses ani broad-spectrum SPF 30+ sunscreen wear kha, every 2 hours reapplied. |
| 8–10 | Borobor Very high risk: unprotected skin ani eyes damaged kha ani quickly burn kha. Middle of the day chak sun chak time minimize kha, shade seek kha, ani clothing, wide-brimmed hat, UV-blocking sunglasses ani broad-spectrum SPF 30+ sunscreen chak cover up kha, every 2 hours reapplied. |
| 11+ | Extreme Extreme risk: unprotected skin ani eyes minutes chak burn kha. Middle of the day chak sun avoid kha try kha, shade chak stay kha, ani every protection use kha: clothing, wide-brimmed hat, UV-blocking sunglasses ani broad-spectrum SPF 30+ sunscreen, every 2 hours reapplied. |
Kuti nijong chak
Health agencies-ya UV index 3 ba khra khutni nijong chakna kethwi. Amak city page-ya kotha kotha city-ni 3 rekhachakna kethwi khutni chak.
Shadow rule: aokha shadow aokha chini kha chini, sun's UV khwchak - aokha rakha.
UV index kha kha chawi
Sungni height ni kwi chawi: Solar noon, summer ani equator ni khusa UV ni kwi. Ozone ni pat ni UV ni kwi. Cloud ni UV ni chawi, kintu khusa ni kwi chawi. Altitude ni 1,000 m ni khusa 10% ni kwi. Snow ni 80% UV ni reflect kha, sand ani sea foam ni 15–25% ni reflect kha, so shade ni khusa beach ni khusa ski slope ni khusa burn kha.