| Summary: | Indoor air quality is particularly important not only in schools, hospitals, nursing homes and other environments that accommodate sensitive people, but also in production places with high cleanliness requirements. At present, most researches are aimed at testing the mass concentration of contaminants and there are few characterizations of the release characteristics(that is, the release rate) of contaminants. Air pollutants are generally include particulate contaminants and gaseous contaminants. This paper takes cigarettes as typical representatives of particulate contaminants and takes the solid particulate matters PM2.5 produced by cigarettes as the research object. In the 30m3 air purification test chamber, the PM2.5 release rate produced by smoldering cigarette and the smoke generator, the diffusion rate and mass concentration of PM2.5 in the air purification test chamber were tested. According to linear regression, the fitting curve of PM2.5 mass concentration of cigarette smoldering and smoke generator was obtained and the release rate law and the static diffusion and dynamic diffusion law of PM2.5 in the test chamber were obtained. The research results can provide basic data when there are PM2.5 particulate matters pollution sources in the indoor environment and provide scientific and reasonable important basis for subsequent research on airflow organization, ventilation frequency, indoor cleanliness, etc.
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