The UK is experiencing a period of extreme heat with correspondingly high ultraviolet radiation levels expected across many areas. Ultraviolet radiation, emitted by the sun and penetrating Earth’s atmosphere, plays a complex role in human health with both beneficial and harmful effects.
Moderate sun exposure enables the skin to produce vitamin D, which supports bone function, blood cell development, and immune system performance. However, excessive UV exposure poses significant health risks. According to experts, repeated exposure to UV radiation, particularly sunburns, elevates the risk of skin cancer development. Melanoma, described as the most dangerous form of skin cancer, ranks as the fifth most common cancer in the UK. Beyond cancer risk, UV radiation contributes substantially to skin aging, producing wrinkles and skin laxity, and has been associated with eye conditions including cataracts.
UV radiation intensity fluctuates throughout the day, with peak levels occurring during a four-hour window around solar noon, typically from late morning through early afternoon. The UV Index, a globally standardized measurement scale, ranges from zero and can exceed 10, with higher values indicating greater potential for skin and eye damage and shorter timeframes for harm to occur. In the UK, summer UV levels typically range between 5 and 6, with maxima of 8 occurring only under exceptional conditions. By contrast, equatorial regions experience consistently elevated UV levels; Nairobi, Kenya maintains UV levels exceeding 10 year-round, while Majorca, Spain typically reaches nine during June and July.
Health authorities recommend protective measures when UV levels are medium or higher. The NHS advises using sunscreen with a sun protection factor of 30 or above with at least 4-star UVA protection, applied to all exposed skin approximately 30 minutes before sun exposure and reapplied every two hours or after swimming or perspiring. Adults should apply approximately six to eight teaspoons for full-body coverage. Additional protective strategies include wearing protective clothing and sunglasses, seeking shade during peak sun hours between 11:00 and 15:00 from March to October, and avoiding intentional tanning. Children require enhanced protection due to greater UV sensitivity. Dermatologists emphasize that natural tanning provides minimal protection, equivalent to SPF 4, and recommend self-tanning products as safer alternatives.
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