Every summer, the sun is shining in most parts of our country, and the temperature is as high as 36 degrees Celsius. This is a frowning thing for people who like to travel or outdoor activities. Especially for women who love beauty, the ultraviolet rays in the sun can harm their delicate skin. As the earth’s environment is deteriorating day by day, the ozone layer in the atmosphere has been destroyed, making the sun’s ultraviolet rays on the earth’s surface also show an increasing trend. According to measurement, the atmospheric ozone layer in Beijing area has been reduced by about 8% than before, and every 1% reduction in the ozone layer will increase the incidence of human skin cancer by 2%-6%. Sun protection cannot be taken lightly.
Ultraviolet rays are the “big enemy” of skin health and beauty
According to Dr. Zou Xianbiao, director of the Dermatology Department of the First Affiliated Hospital of the PLA General Hospital, ultraviolet rays are divided into three categories according to different wavelengths, long-wave ultraviolet UVA, medium-wave ultraviolet UVB and short-wave ultraviolet UVC. Among them, short-wave ultraviolet rays cannot reach the ground due to the absorption and scattering of the ozone layer, and long-wave ultraviolet rays UVA and medium-wave ultraviolet rays UVB reach the ground.
Human skin will be sunburned or tanned, mainly depends on two factors: one is related to the wavelength of ultraviolet light. Ultraviolet rays of the medium wave can make the skin sunburn, and ultraviolet rays of the long wave can make the skin tan. The second is related to skin type. Foreign researchers have divided the skin erythema and pigmentation after sun exposure into six types: Asians generally have type Ⅲ or type Ⅳ skin, and women and children who are outdoors in summer are more likely to get sunburned. It is manifested as diffuse erythema (ie sunburn) on the bare skin, itchy skin, burning pain, and sometimes swelling, severe skin blisters, and can even cause headaches, nausea, fever, fatigue, palpitations, Systemic symptoms such as delirium until heat stroke. The skin’s response to ultraviolet rays reached the highest peak the next day after sun exposure. After that, this reaction will gradually decrease, and there will be scaly and pigmentation. The whole process is the phototoxic reaction of ultraviolet rays to the skin.
If you live or work in a strong ultraviolet environment for a long time, it will undoubtedly accelerate the aging of the skin. Over time, the skin will lose its proper gloss, become gray, rough and thick, and prematurely appear stains and wrinkles. Since the depth of ultraviolet penetration into the skin is closely related to the wavelength, as the wavelength increases, the amount of ultraviolet penetration into the skin also increases, the depth also increases, and the skin damage will also increase.