The atmospheric pollutant diffusion model is a mathematical model that simulates the transportation, diffusion and migration process of atmospheric pollutants and predicts the temporal and spatial distribution of pollutant concentration under different pollution source conditions, meteorological conditions and underlying surface conditions. It is a simplified mathematical description of the migration and diffusion law of pollutants in the lower atmosphere. According to different modeling theory systems, pollutant migration and diffusion processes and different description objects, the forms of models are also different. Generally speaking, Gaussian smoke flow model is the most widely used, which is suitable for estimating the concentration of continuous overhead point source pollutants in small-scale and steady flow field. Masks can not only prevent smog, but also block droplets carrying bacteria and viruses. These droplets can spread through the air, and the spread distance of infectious droplets can even reach about 48 meters. Droplets are a potential health threat. If inhaled for a certain period of time, and the body's resistance is just weak, it is likely to develop into a disease. Spring is a period of high incidence of infectious diseases, so it is particularly important to take preventive measures. Wear masks in crowded public places, wash your hands before eating, and exercise to enhance your resistance. Puweixin, an advanced medical mask imported from the United States, can effectively filter bacteria spread in the air. It is comfortable to wear, without choking and strangulation marks, and the material in contact with the skin is smooth.