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Scattered UV beneath public shade structures during winters.

D J Turnbull1, A V Parisi, J Sabburg

  • 1Centre for Astronomy, Solar Radiation and Climate, University of Southern Queensland, Toowoomba, QLD, Australia. turnbull@usq.edu.au

Photochemistry and Photobiology
|August 30, 2003
PubMed
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Public shade structures offer limited protection against ultraviolet (UV) radiation in winter. Erythema UV levels under shade can still cause sun-related disorders, highlighting the need for sun safety measures even in shaded areas.

Area of Science:

  • Environmental Science
  • Public Health
  • Atmospheric Physics

Background:

  • Ultraviolet (UV) radiation poses risks for skin health.
  • Shade structures are commonly used for sun protection.
  • Understanding UV penetration through shade is crucial for public health.

Purpose of the Study:

  • To quantify UV radiation levels under different-sized shade structures.
  • To establish a relationship between diffuse UV and UV under shade.
  • To assess the effectiveness of shade structures in reducing UV exposure during Southern Hemisphere winter.

Main Methods:

  • Broadband field measurements of UV radiation beneath small, medium, and large shade structures.
  • Comparison of shaded UV measurements with diffuse UV.

Related Experiment Videos

  • Analysis of UV data in relation to solar zenith angles (SZA).

    • Main Results:

    • A predictive relationship between diffuse UV and shaded UV was established for clear skies and SZAs of 49-76 degrees.
    • Ultraviolet Protection Factors (UPFs) ranged from 1.5 to 5.4.
    • Erythemal UV under shade varied from 18% to 65% of full sun levels, depending on shade size and SZA.

    Conclusions:

    • Shade structures provide partial UV reduction, with effectiveness varying by size and solar angle.
    • UV radiation levels in shaded areas during winter can be sufficient to cause erythema and other sun-related issues.
    • Further research and public awareness regarding UV protection are necessary, even when using shade structures.