Which type of UV radiation is primarily responsible for skin aging?

UVA radiation is primarily responsible for skin aging. This type of UV radiation penetrates the skin more deeply than UVB and is associated with the skin's aging process, including the formation of wrinkles and loss of skin elasticity. UVA rays can damage collagen and elastin fibers, which are crucial for maintaining the skin's structure and appearance. Unlike UVB radiation, which is mainly linked to sunburn, UVA radiation can cause long-term skin damage even on cloudy days or during indoor tanning.

In contrast, UVB radiation primarily affects the skin's surface and is mainly responsible for sunburns and the development of skin cancers. UVC radiation, while the most harmful type of UV light, is almost completely absorbed by the Earth's atmosphere and does not reach the skin. Visible light, although it can have some effects on the skin, is not classified as UV radiation and does not play a significant role in skin aging. Understanding these distinctions is essential for effective skin care and protection against premature aging.