Prevention of aerosol production can be started by wearing goggles and protective masks; avoiding crowd gathering; opening windows and ventilating more often; doing daily disinfection, such as wiping and disinfecting key areas such as door handles or toilet seats with 75% alcohol and chlorine disinfectant; washing hands with running water, soap and hand sanitizer before and after meals. Use tissues or bend your elbows to cover your mouth and nose when coughing or sneezing; avoid contact with body secretions from patients with suspected symptoms and do not share personal items to avoid the production and spread of aerosols. Aerosols are droplets mixed in the air, forming a particle diameter of 0.001-100μm dispersion system, can be suspended in the air for a long time and with the air flow and migration, its transmission distance can reach hundreds of meters, the human body is easy to cause infection after inhalation. Aerosol generation and diffusion from the concentration difference or other driving forces, is the molecules, atoms and other thermal movement caused by the migration of substances in space, is a basic way of mass transfer, but also the physical basis of the process of mass transfer and separation. Usually aerosols can be produced when sneezing, coughing, talking, spitting, vomiting, or when urinating or defecating to flush water. Aerosols are generated when doing medical operations such as tracheal intubation, bronchoscopy, dental operations, or when medical examiners come in contact with patients’ blood, urine, or stool samples. In crowded elevators and in poorly ventilated toilets, there is a risk of aerosol transmission. Since most of the aerosol particles are >50μm, they can usually be blocked by using a medical mask. Content source: Dr. Yurai