Lehae › Sekala sa boemo ba UV
Sekala sa boemo ba UV
Boemo ba UV bo lekanya hore na mahlaseli a ultraviolet a chesang a letsatsi a matla hakae, holim'a sekala se qalang ho 0 se se nang moeli o kaholimo. Ha palo e le kholo, letlalo le mahlo a sa sireletsoang a senyeha ka potlako. Sekala le mebala li tšoana lefats'e ka bophara (World Health Organization); United States ponelopele e fanoa ke EPA le National Weather Service.
| Bohlokoa ba UV | Boemo |
|---|---|
| 0–2 | Tlase Kotsi e tlase ho tsoa mahlaseling a letsatsi bakeng sa motho ea tloaelehileng. Apara likhalase tsa letsatsi matsatsing a khanyang. Haeba u chesa habonolo, ipokele 'me u sebelise sunscreen ea SPF 30+ e pharaletseng. Lehlabathe, metsi le lehloa li bonahatsa UV 'me li eketsa ho pepeseha ha hau. |
| 3–5 | Mahareng Kotsi e mahareng ho tsoa ho pepeseheng letsatsing ntle le tšireletso. Lula moriting haufi le motšehare, ha letsatsi le le matla haholo. Apara liaparo tse sireletsang, khatla e sephara le likhalase tsa letsatsi tse thibelang UV, 'me u behe sunscreen ea SPF 30+ e pharaletseng lihora tse ling le tse ling tse 2, leha ho le maru, le ka mor'a ho sesa kapa ho hohola. |
| 6–7 | Holimo Kotsi e holimo ho tsoa ho pepeseheng letsatsing ntle le tšireletso: letlalo le mahlo a hloka tšireletso. Fokotsa nako letsatsing haufi le bohareng ba letsatsi, batla moriti, 'me u apare liaparo tse sireletsang, khatla e sephara, likhalase tsa letsatsi tse thibelang UV le sunscreen ea SPF 30+ e pharaletseng, e beoang hape lihora tse ling le tse ling tse 2. |
| 8–10 | Holimo haholo Kotsi e holimo haholo: letlalo le mahlo a sa sireletsoang a ka senyeha 'me a chesa kapele. Fokotsa nako letsatsing haufi le bohareng ba letsatsi, batla moriti, 'me ipokele ka liaparo, khatla e sephara, likhalase tsa letsatsi tse thibelang UV le sunscreen ea SPF 30+ e pharaletseng, e beoang hape lihora tse ling le tse ling tse 2. |
| 11+ | Bohloko Kotsi e bohloko: letlalo le mahlo a sa sireletsoang a ka chesa ka metsotso. Leka ho qoba letsatsi haufi le bohareng ba letsatsi, lula moriting, 'me u sebelise tšireletso eohle: liaparo, khatla e sephara, likhalase tsa letsatsi tse thibelang UV le sunscreen ea SPF 30+ e pharaletseng, e beoang hape lihora tse ling le tse ling tse 2. |
Nako ea ho ipata
Lihlopha tsa bophelo bo botle li khothaletsa tšireletso neng kapa neng ha boemo ba UV bo le 3 kapa ho feta. Likarolo tsa toropo ea rona li bontša lihora tse nepahetseng tseo ponelopele ea kajeno e fihlang ho 3 toropong ka 'ngoe.
Molao oa moriti: haeba moriti oa hau o le mokhutšoane ho feta uena, UV ea letsatsi e matla haholo — iphele tšireletso.
Se fetolang boemo ba UV
Bophahamo ba letsatsi bo bohlokoa haholo: UV e matla haholo hoseng bohareng ba letsatsi, lehlabula le haufi le equator. Ozone e tšesaane e lumella UV e ngata ho feta. Maru hangata a theola boemo empa a ka bo phahamisa ka nako e khutšoanyane mahlakoreng a tsona. Bophahamo bo eketsa hoo e ka bang 10% bakeng sa 1,000 m ka 'ngoe. Lehloa le bonahatsa ho fihlela ho 80% ea UV, lehlabathe le foam ea leoatle hoo e ka bang 15–25%, kahoo u ka chesa moriting lebopong kapa thabeng ea ski.