Usually, short-wave ultraviolet rays are absorbed by the atmospheric ozone layer and cannot reach the surface of the earth, so they will not directly threaten the human body; The absorption of UVB by human skin will cause skin trouble, skin thickening and aging, and then skin blackening, forming the so-called "sunburn"; Long-wave ultraviolet rays have strong penetrating power, which can penetrate the skin surface to reach leather, induce erythema and pigmentation, and make the melanin formed on the skin turn black rapidly.
It can harm people's skin, eyes and immune system. It can destroy human skin cells and protein structure in vivo, so that elastic fibers and collagen fibers of skin are destroyed, resulting in wrinkles, pigments, skin failure and severe ultraviolet radiation symptoms, as well as skin and mucous membranes. Corpoysia, even throwing cancer.
Long-term exposure to ultraviolet rays is easy to produce free radicals in the body and increase the oxidative stress in the body. At the same time, UVA and UVB are also harmful to eyes. Medical research has confirmed that an extra hour of sun exposure will increase the possibility of cataract in 10%. So what should we use to prevent the damage of ultraviolet rays?
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April-September is the strongest season for ultraviolet rays, and 2 pm is the strongest time for ultraviolet rays in the morning. It is the peak of ultraviolet radiation. So use umbrellas in the suburbs.
Apply sunscreen
Sunscreen can protect the skin to some extent. At present, all major department stores have skin cream or sunscreen to prevent ultraviolet rays from absorbing and whitening skin. You can apply 1 2 times before going out to prevent skin aging. But the use of sunscreen must be carried out, because sunscreen can only last for two to three hours, so if it is outdoor sports, you need to apply sunscreen many times.
put on/wear a cap/hat
Sun protection of hair is also very important. Whether it's wearing a hat, a headscarf or polishing in the sun. In short, don't expose your hair to the sun. I must dry the cream in advance to prevent sunburn. Because hair is exposed to toxic sunlight, it will lose moisture, change, be fluffy, fragile and easy to rest. Sun protection methods vary from person to person. If you have a good sunscreen method, the effect is very good, and then continue to maintain it. The damage we are talking about here is excessive ultraviolet rays. However, the human body can't be completely without sunlight. Without light, babies are prone to illness, and adults are prone to osteomalacia and osteoporosis. Appropriate ultraviolet rays can be used to sterilize and inhibit the growth of harmful bacteria. Therefore, advocating moderate sunshine and healthy sunshine, rejecting the toxins brought by sunshine, will also accept the health of sunshine.
4. Health tips
You should prevent ultraviolet rays in winter. If you go riding or skiing, you must wear a hat, scarf, sunglasses, etc., because snow will reflect stronger ultraviolet rays to avoid injury. With the increase of age, the metabolic rate of skin cells slows down. It is recommended that girls over 25 years old use professional skin cream and liquid foundation.