Health officials are warning of elevated ultraviolet radiation levels across the United Kingdom during a period of forecasted extreme heat. UV radiation, emitted by the Sun and penetrating Earth’s atmosphere, plays a necessary role in human health by enabling skin to produce vitamin D, which supports bone function, blood cell production, and immune system activity.
However, excessive exposure carries substantial health risks. Extended UV exposure can damage the DNA in skin cells, leading to skin cancer development. The condition also accelerates skin aging, contributing to wrinkles and skin laxity. Additionally, UV radiation has been associated with eye conditions including cataracts. According to Prof Dorothy Bennett from St George’s, University of London, each UV exposure—particularly sunburns—increases skin cancer risk, with melanoma now representing the fifth most common cancer type in the UK.
UV radiation intensity varies throughout the day, with the highest levels occurring during a four-hour window centered on solar noon, typically from late morning through early afternoon. The UV Index measures ultraviolet radiation on a scale beginning at zero and potentially exceeding 10, with higher values indicating greater potential for skin and eye damage and faster onset of harm. In the UK, summer UV levels typically range from 5-6, with maximum readings of 8 only in exceptional circumstances. Regions near the equator experience substantially higher levels year-round, with some areas like Nairobi recording UV levels above 10 consistently.
The World Health Organization recommends sun protection when UV levels are medium (3-5) or higher, with additional precautions required at very high (8-10) or extremely high (11+) levels. Children require greater protection than adults due to increased sensitivity. The NHS advises using sunscreen with SPF 30 or above offering at least 4-star UVA protection, applied to all exposed skin approximately 30 minutes before sun exposure, with reapplication every two hours or after water contact. Additional protective measures include wearing appropriate clothing, using sunglasses, and seeking shade between 11:00 and 15:00 from March through October in the UK.
Experts emphasize that UV exposure risk is not determined by air temperature and that UV penetrates thin clouds, meaning skin damage can occur on cooler or overcast days. The broader health risks from excessive UV exposure, including eye damage and immune system effects, affect individuals across all skin tones, though dermatologists note that skin cancer can develop in people of all ethnicities.
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