Which type of UV radiation penetrates the deepest into the skin?

UVA radiation is known to penetrate the skin more deeply than UVB and UVC radiation. It reaches the dermis, which is the second layer of skin, and can cause long-term damage, such as premature aging and an increased risk of skin cancer. This penetration occurs because UVA rays have a longer wavelength compared to UVB and UVC rays. While UVB rays primarily affect the outer layer of skin (the epidermis) and are responsible for sunburn and more immediate skin damage, and UVC rays are mostly absorbed by the Earth's atmosphere and do not reach the skin at all, it is the UVA rays that have the most significant ability to penetrate deeper layers of skin tissue. This characteristic of UVA radiation underscores the importance of protecting the skin from all types of UV radiation to prevent both immediate and long-term damage.