Aerosol generally refers to particles suspended in air, a gelatinous dispersion system consisting of solid or liquid particles dispersed in the gaseous state. Liquid aerosols are often referred to as fog, and solid aerosols are often referred to as fog smoke. Excessive concentrations of aerosols can be hazardous to human health, especially to asthmatics and people with other respiratory diseases that can cause secondary damage such as leading to bronchial fibrosis. Large particles in aerosols sink quickly and are less likely to enter the respiratory tract. Smaller particles float with the air and remain there for a long time. If in a closed environment, these small particles, under the action of atmospheric pressure, can easily be inhaled into the respiratory tract causing interpersonal transmission of pathogens. Preventing infectious diseases caused by aerosols can be done by reducing socialization and meeting with friends. Open windows to allow air to circulate. Pay attention to personal hygiene, wash your hands when eating, and cover your mouth and nose with a tissue when coughing and sneezing.