Ultraviolet light has a very strong effect of killing and sterilizing, such as sunlight contains a strong ultraviolet function, ultraviolet light reaches a certain intensity, lasts a certain time, can achieve the effect of killing and sterilizing. In addition to sunlight, the hospital will be used inside the UV lamp to irradiate the local environment, can play the role of ultraviolet disinfection. However, in the process of UV disinfection, it will produce by-products, namely ozone, which can have a strong stimulating effect on the respiratory tract. Therefore, after UV disinfection of the closed environment, after the end of UV disinfection, the first thing to do is to open the windows to ventilate, open the windows to reduce the concentration of ozone and avoid ozone irritation. Content source: Dr. You Lai