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Ozone / UV index (sun exposure planning)

Ozone / UV index (sun exposure planning) reference article on thruhikingwiki.com.

Overview

Ozone levels and the UV index measure the intensity of ultraviolet radiation reaching the Earth's surface. These values help hikers plan for sun exposure, particularly in high-elevation or low-ozone regions.

Key points

  • UV index indicates daily ultraviolet intensity on a standardized scale.
  • Higher values correspond to increased risk of sunburn and skin damage.
  • Ozone concentration affects how much UV radiation penetrates the atmosphere.
  • High elevations, deserts, and snow-covered terrain increase UV exposure.
  • Useful for planning clothing, sunscreen use, and timing of travel.
  • Protective measures reduce long-term skin and eye damage.

Details

The UV index is a daily forecast that quantifies the amount of ultraviolet radiation reaching ground level. High UV index values signal greater potential for skin damage, sunburn, and eye strain. Ozone concentration also plays a role in filtering UV radiation, with lower ozone levels allowing more UV radiation to pass.

For hikers, awareness of UV exposure is especially important in open desert environments, high-altitude terrain, and reflective landscapes such as snowfields. Sun-protective clothing, wide-brimmed hats, sunglasses, and regular sunscreen application help manage risks.

Monitoring UV forecasts assists in planning early starts, shaded breaks, or modifying daily distances during periods of extreme exposure.

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Illustrative hiking footage

The following external videos offer general visual context for typical hiking environments. They are not official route recommendations, safety instructions, or planning tools.