Sunlight contains two types of harmful UV rays: UVA and UVB. Both can cause skin cancer and not only on sunny days, but also on cloudy days with high UV radiation.
UVA rays can cause premature aging of your skin in the form of wrinkles and age spots. Even sensible sun exposure can have cosmetic consequences because the sun in any case causes premature skin aging. Sun damaged skin can appear lined, rough, dry and yellowish. The effect is called “photo-aging”.
UVA rays can even penetrate glass and even through car windows. We cannot see UVA rays, so it is very important to ensure a sunscreen that protects well against UVA rays.
UVB rays are stronger and therefore the primary cause of sunburn and skin cancer, but are blocked by window glass. UVB rays are responsible for sunburns and play a significant role in the development of skin cancer.
It is not possible to prevent UVA and UVB rays, but it is possible to reduce the effect.