Firstly, we must remember that UV rays are not totally and compltely harmful. They allow us to produce Vitamin D, which helps us absorb calcium. But, overexposure is, indeed, harmful.
There are three types of UV rays:
UVA rays “cause skin aging and wrinkling and contribute to skin cancer, such as melanoma”. They are the most prevalent rays, since they can pass easily through the ozone
UVB rays cause “sunburns, cataracts (clouding of the eye lens), and immune system damage”. They also contribute to skin cancer. Melanoma is linked to terrible UVB sunburns that happen before the age of 20.
UVC rays are extremely dangerous. However, they cannot pass through the ozone, so most people are protected from those.
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