Not wearing a mask during an epidemic may have hazards such as accelerating the spread of bacteria and viruses and breathing haze. 1. Accelerating the spread of bacteria and viruses: Usually in public places with a large flow of people, bacteria or viruses will be spread in the air through droplets, and there is a phenomenon of virus and bacteria transmission. In order to avoid jeopardizing the health of others and yourself, you should pay attention to wearing masks during the epidemic. 2. Breathing haze: Haze contains many toxic substances that may cause harm to the human body, and usually wearing a mask can reduce the incidence of respiratory diseases. Patients are advised to wear masks when going out or in public places and change them in time. If there is any abnormality, they should go to the hospital for examination in time and be treated under the guidance of the doctor.