Flight passengers in window seat urged to be aware of little-known issue

The window seat on a flight is often a popular choice for travellers, especially on a long haul flight when they might want to take a nap.

Earlier this year, a TikTok user named FindingFiona suggested that passengers occupying this particular seat should apply sunscreen during flights.

She supported her claim by referencing reports which stated that individuals are more susceptible to sun damage at higher altitudes.

"Even though you're inside the aircraft, because of the high altitudes, you're actually experiencing stronger UV radiation, especially if you're in the window seat," she explained in the video.

Dr Elizabeth Jones, an assistant professor of dermatology at Thomas Jefferson University Hospital in Philadelphia, has offered her perspective on the matter.

The dermatologist suggests that the "true risk" for occasional flyers "is probably low", but added: "People who are flying occupationally, they're going to be exposed much more to ultraviolet light given - especially if they're in the cockpit - the size of the windshield."

Dr Jones states that airplane windows "block out most of the UVB rays", a type of ultraviolet (UV) radiation from the sun.

These rays have a medium wavelength, shorter than UVA rays but longer than UVC rays.

UVB rays are primarily responsible for causing sunburn and can damage the DNA in skin cells, which can increase the risk of skin cancer.

According to Dr Jones, aircraft windows fail to completely block UVA rays, which can lead to premature ageing, wrinkles, and potentially contribute to skin cancer.

As reported by Yahoo! Life, she stated: "Some of the older windows block out about 50% of UVA rays and "some of the newer models are more effective at even blocking out UVA."

Cleveland Clinic notes that UVA light is primarily associated with long-term skin damage, such as wrinkles, and may play a role in certain types of skin cancer.

Wearing sunscreen on a plane is recommended as this can protect you from harmful rays, which another dermatologist says can penetrate “more deeply into the skin”.

Moreover, the dermatologist from U.S. Dermatology Partners Tyler in Texas warns that exposure to these rays can put travellers at risk of developing various types of skin cancer, including melanoma.

Certified dermatologist Dr Danny Guo points out that UV levels at high altitudes are significantly stronger than on the ground.

According to Condé Nast Traveller, he stated: "There is a 2% increase in UV radiation per 1,000 feet increase in altitude.

"Given that the average flight is around 30,000 to 40,000 feet in altitude, this is a 60-80% increase in UV radiation levels compared to the ground."

Dr Mamina Turegano added that repeated skin damage accelerates signs of skin ageing, such as hyperpigmentation, sunspots, and wrinkles.

She highlighted a 2019 meta-analysis that found airline pilots and cabin crew face around double the risk of melanoma and other skin cancers, compared to the general population.

However, it's important to note that most of the evidence was gathered several decades ago and their relevance to contemporary levels of risk is uncertain.

In summary, if you're seated beside a window on a daytime flight of longer duration, slathering on some sunscreen is a good idea. Conversely, if you're situated in an aisle or middle seat away from direct sunlight, it’s less critical but still not harmful.

La Roche-Posay, a dermatologist-recommended skincare brand, says strong daily sunscreen habits should be seen as a non-negotiable, and can make a huge difference to your skin – in how it looks and by preventing sun damage.

The NHS advises against relying on sunscreen alone to protect yourself from the sun. You should also consider suitable clothing and spend time in the shade when the sun is at its hottest.

When choosing a sunscreen, ensure the packaging boasts:

• a sun protection factor (SPF) of at least 30 to protect against UVB
• at least 4-star UVA protection

UVA protection can also be indicated by the letters "UVA" in a circle, which indicates that it meets the EU standard.

You should also make sure that sunscreen is not past its expiry date.