what is the highest uv ever recorded

The highest UV Index ever recorded reached an extreme 43.3. This measurement occurred on December 29, 2003, at the summit of Licancabur Volcano on the Bolivia-Chile border in the Andes.

Record Details

This staggering UV reading was captured by astrobiologists from the US and Germany using specialized detectors at nearly 19,700 feet (5,920 meters) elevation. The site's thin atmosphere, high altitude, ozone depletion, and reflective snow amplified solar radiation to levels more akin to Mars than Earth. While some experts debate the exact figure—proposing values around 26 due to calibration—the 43.3 mark stands as the official record per Guinness World Records and scientific reports.

Why It Matters

UV Indexes above 11 signal extreme risk , but 43.3 dwarfs everyday highs (like mid-20s in the Andes). Such events highlight vulnerabilities in high- altitude, low-ozone zones, urging strict sun protection like full-coverage clothing and SPF 50+. No higher readings have surfaced in recent years, despite monitoring.

Key Facts

• Date : December 29, 2003

• Location : Licancabur Volcano summit, Bolivia

• Elevation : ~19,700 ft (5,920 m)

• Conditions : Ozone hole influence, clear skies, reflection

• Implications : Far exceeds "very high" (8-10) daily forecasts

"A UV index of 43 is more similar to surface radiation on Mars than typical conditions on Earth."

TL;DR: 43.3 UV Index on Licancabur Volcano, 2003—still the record.

Information gathered from public forums or data available on the internet and portrayed here.