What is the difference between UVA and UVB rays?

The distinction between UVA and UVB rays lies in their penetration and effects on the skin. UVA rays penetrate the skin more deeply than UVB rays and are primarily responsible for long-term skin damage, such as skin aging and the formation of wrinkles. They can also contribute to the development of skin cancers over time because of their ability to penetrate deeper tissues.

In contrast, UVB rays are responsible for causing sunburn and play a direct role in the production of vitamin D in the skin. While UVB rays have a significant impact on the outer layers of the skin, their shorter wavelength means they do not penetrate as deeply as UVA rays. This distinction is crucial for understanding the different ways these types of ultraviolet rays affect skin health and the importance of protecting oneself from both types when exposed to sunlight.