It is summer, and the sun is strong.
Many people are also worried about the invasion of ultraviolet rays while bathing in the summer sun.
What is the UV that makes people talk about it? What are the hazards of ultraviolet light on the human body? How should summer reduce the damage of ultraviolet rays to the human body?
Ultraviolet light is an electromagnetic wave having a wavelength of 100 to 400 nm. According to the wavelength and biological effects, it is mainly divided into three bands, long-wave UVA, medium-wave UVB and short-wave UVC.
Ultraviolet rays account for about 13% of sunlight, UVA accounts for about 97% in nature, and UVB accounts for only 3%. In general, the shorter the wavelength of ultraviolet light, the stronger the lethality.
Gong Yeqing, deputy director of the Department of Laser Physiotherapy, Guangzhou Institute of Dermatology, said in an interview that exposure to ultraviolet light can cause skin aging, wrinkles, and even skin cancer and lupus erythematosus; medium-long wave ultraviolet rays can cause skin tanning It can directly reach the dermis layer of the skin, destroy collagen and elastic fibers, and produce photoaging, and this effect is superimposable and accumulative, which can cause long-lasting sunburn and coated fabric aging on the skin; 50%~70% of skin cancer is caused by Excessive ultraviolet radiation, common in skin malignant melanoma, squamous cell carcinoma of the skin, basal cell carcinoma of the skin, etc.; in addition, although freckles are caused by heredity, it is still unable to cure, but ultraviolet light is the primary factor for its deterioration.
So how do you protect your skin from UV rays in the summer?
When going out, it is best to avoid the time and place of strong UV rays.
Liu Yong, deputy director of the dermatology department of Shanxi Grand Hospital, explained in an interview: "In the middle of the day, the ultraviolet rays are the strongest at noon, and the spring and summer in the year is the strongest season of ultraviolet rays."
Liu Yong also said that the higher the altitude, the stronger the ultraviolet rays, and the beaches, snow, urban high-rise buildings or glass curtain walls, car window glass, and floor hardening will reflect ultraviolet rays, thereby increasing the intensity of ultraviolet rays. When you are outdoors, you should pay attention to avoiding the strong time and place of ultraviolet rays. When going out, try to engage in outdoor activities in the trees and the slopes.
When purchasing clothes, you should pay attention to the higher the density of the clothes, the darker the color, or the sunscreen coating, the better the sun protection effect. In summer, it is best to buy fabric products with UPF greater than 25 and UV transmittance less than 5%.
