J
j.
Guest
This is just what I believe.
Authorities advice to get sun exposure after 4 p.m. If you sunbathe after 4 p.m., I believe you're more likely to get skin damage. What happens is that the damage from UVA rays is less noticeable. UVA tans you, but it doesn't produce sunburn. So you don't notice all the harm that is occurring. After 4 p.m., your UV exposure is practically pure UVA.
If you get sun exposure when UVB is high, like at 1 p.m.(*), your body will alert you if you stayed too long, because excess UVB rays provoke redenning of the skin. So if your skin looks pink, the next time you should stay a shorter amount of time.
Moreover, only UVB creates vitamin D, and UVA alone, or with very low UVB, might even destroy vitamin D.
(*) If it's cloudy, or at certain times of the year, UVB might not be intense even at 1 p.m.
Authorities advice to get sun exposure after 4 p.m. If you sunbathe after 4 p.m., I believe you're more likely to get skin damage. What happens is that the damage from UVA rays is less noticeable. UVA tans you, but it doesn't produce sunburn. So you don't notice all the harm that is occurring. After 4 p.m., your UV exposure is practically pure UVA.
If you get sun exposure when UVB is high, like at 1 p.m.(*), your body will alert you if you stayed too long, because excess UVB rays provoke redenning of the skin. So if your skin looks pink, the next time you should stay a shorter amount of time.
Moreover, only UVB creates vitamin D, and UVA alone, or with very low UVB, might even destroy vitamin D.
(*) If it's cloudy, or at certain times of the year, UVB might not be intense even at 1 p.m.