BACKGROUND:
Queensland has the highest rates of melanoma and skin cancer in the world. Episodes of sunburn occur despite public education. Portable beach shelters are used as a sun protection strategy however is the assumption correct the higher the UPF rating, the better the shade? In addition recent research focuses on prolonged exposure to lower UV Index (UVI) may be contributing to DNA damage. This original study measured real-world UVI under two portable beach shelters and evaluated the impact of dynamically positioned side walls.
METHOD:
On 12th February, 2026, UVI measurements were conducted at Mooloolabba Beach, Queensland (latitude 26.68°S) under extreme UV conditions (predicted UVI 13; ARPANSA - classified extreme). A calibrated Solarmeter Model 6.5 (280nm-400nm, NIST-traceable) recorded UVI in horizontal and vertical planes during the day under a UPF50+ portable beach shelter without side walls and a UPF30+ shelter with a fixed rear wall and two dynamically repositioned side walls.
RESULTS:
Under the UPF50+ canopy, 88.9 % of the vertical UVI readings were ≥1, 38.9% were ≥2, and 16.8% ≥3; in the horizontal plane, 69% were ≥1, 18% were ≥2, and 5% were ≥3. Measured UVI values substantially exceeded predicted values by the UPF rating alone, highlighting significant diffuse radiation being incident from all directions without side walls. The UPF30+ canopy with dynamic side walls achieved an 86% reduction in vertical UVI ≥2 and a 76% reduction in horizontal UVI ≥2, with zero readings ≥3 in either plane.
CONCLUSION:
Significant UVI readings were recorded for the UPF50+ portable beach shelter without side walls highlighting diffuse UV radiation from the open sides. The UPF30+ shelter with side walls that were repositioned with the movement of the sun substantially outperformed the higher rated canopy. Improved public education, upgraded clinical guidance and clearer product labelling is needed. Industry is encouraged to produce portable beach shelters with flexibility to reposition side walls to improve efficiency. Sunscreen, protective clothing and eyewear remain essential regardless of the canopy rating, particularly for children and fair skinned individuals when using portable beach shelters and when using them for prolonged periods.
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