UVA vs. UVB
Sunlight is made up of two different types of rays, both of which are harmful to your skin.
The shortest wavelength of the two is UVB (ultraviolet B) rays. UVB rays typically burn the top, or superficial, layers of your skin. These rays play one of the biggest roles in the development of skin cancer.
The longest wavelength is UVA (ultraviolet A) rays. UVA rays are considered to be the rays responsible for premature aging. These rays penetrate deep into the dermis layer of skin.
Different Intensity Levels
UVB rays correlate to the sun and heat intensity. At dawn, the sun is at its weakest, which means that lower intensity UVB rays are being produced. As the day progresses UVB rays become more intense, with the most powerful rays coming at mid-day when the sun’s intensity is at its peak. As the afternoon progresses, the intensity gradually decreases, as do the UVB rays.
UVA rays are the exact opposite. UVA relates to daylight and not heat. This means that if there is daylight, you are exposed to UVA rays. This exposure remains fairly constant throughout the day. For example, you are going to be more exposed to UVA rays in Canada then you are Florida.
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