Limits RegistryPUBLIC RECORD
Limits RegistryA UV Index of 43.3 was measured at a high-altitude site on the Bolivian Altiplano in the early 2000s — far above the value of 11 that most public UV-Index scales treat as 'extreme' — attributed to the combination of high elevation (thinner, clearer atmosphere), low ozone, and the sun's near-overhead position close to the tropics in the Southern Hemisphere summer. The exact measurement and publication details are less widely corroborated than most entries in this registry, so this figure should be treated as a notable literature-reported extreme rather than an official WMO record.
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A UV Index of 43.3 was measured at a high-altitude site on the Bolivian Altiplano in the early 2000s — far above the value of 11 that most public UV-Index scales treat as 'extreme' — attributed to the combination of high elevation (thinner, clearer atmosphere), low ozone, and the sun's near-overhead position close to the tropics in the Southern Hemisphere summer. The exact measurement and publication details are less widely corroborated than most entries in this registry, so this figure should be treated as a notable literature-reported extreme rather than an official WMO record.
The highest ground-level ultraviolet radiation index ever measured at Earth's surface by a calibrated instrument.
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Permanent ID limitsregistry.com/limits/LR-HIGHEST-UV-INDEX-RECORDED
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Limits Registry. LR-HIGHEST-UV-INDEX-RECORDED. Highest UV Index ever recorded. 2026.