What is the percentage composition of UVA and UVB rays in sunlight?

The percentage composition of UVA and UVB rays in sunlight is indeed characterized by a predominance of UVA rays, with about 95% of the ultraviolet radiation reaching the Earth's surface being UVA, and only about 5% constituting UVB rays.

UVA rays penetrate the skin more deeply and are primarily responsible for photoaging and long-term skin damage, whereas UVB rays are responsible for causing sunburn and play a key role in the development of skin cancer. The higher proportion of UVA rays in sunlight emphasizes the importance of broad-spectrum sun protection, which includes both UVA and UVB protection.

This knowledge is crucial for understanding how to adequately protect the skin from sun damage, and it underscores the importance of products that offer broad-spectrum protection to shield against the potential harms of both types of UV radiation.