Aerosols are capable of spreading over distances of tens to hundreds of meters. Aerosols are sols formed by taking solids or liquids as the dispersant and gases as the dispersing medium. Solid and liquid particles in the atmosphere for Brownian motion, not due to gravity and settlement, can be suspended in the atmosphere for months and years. There are some pathogens present in aerosols, which can spread in the air with the movement of aerosols. Aerosols can move with the movement of air currents, and if the surrounding wind is strong, or the movement of air currents is fast, the aerosol will spread over a longer distance. In a stationary gas flow, it can generally spread within tens of meters of the surrounding. If the gas flow is accelerated and more active, the aerosol can spread over hundreds of meters.