What is the difference between UVA and UVB rays?
UVA rays are long-rage rays which penetrate deep within the skin’s surface and cause aging and tanning.
UVB rays are short-range rays which burn the skin’s outer layer.
Skin Science — UVA
How Do We Protect From UVA and UVB Rays?
To protect against both UVA and UVB rays, make sure you choose a broad spectrum sunscreen, and other measures of sun protection such as sun protective clothing, hats, sunglasses, and seek shade.