Hiding in the house in winter and staying out of the sun will keep you away from UV rays? This is not true. Sunlight exposure produces UV rays just as well. Winter UV rays are no worse than summer UV damage to the skin. In the north, sunlight is significantly shorter in winter, and people start to use indoor fluorescent lighting at 4 or 5 pm, especially students and office workers, who spend eight hours or more in the sun every day. Although the intensity is not high, the accumulated UV radiation is quite alarming. Ten hours of exposure to fluorescent lights absorbs the same amount of UV light as one hour of exposure to the sun, and this does not include the UV light received from daylight activities. Many people think that winter UV rays are less than summer, so winter is not afraid of the sun. This is actually a misconception. There are medium-wave and long-wave ultraviolet rays. Medium wave (UVB) will make our skin tanned and sunburned, and UVB is stronger in summer than in winter. But long wave (UVA) in winter and summer is similar, as will produce damage to the skin. Therefore, winter sun protection can not be sloppy. It is recommended that winter sun protection can take SPF 15 sunscreen, and you should try to wear hats, glasses and other cover-ups when you travel. Especially in snowy days, ultraviolet rays are extra strong than usual, especially to pay attention to sun protection.