Field investigation on seasonal variation of bacterial aerosol concentration in a university classroom in Beijing
Miao Doudou, Chen Chao and Zhao Chen
In order to explore the seasonal variation of bacterial aerosol concentration level and particle size distribution characteristics in university classrooms, measures the indoor and outdoor bacterial aerosol concentration and environmental parameters (temperature, humidity, particle concentration) of a university classroom in Beijing. The results show that the concentration of outdoor bacterial aerosol is from 7 to 1 237 cfu/m3, the average maximum concentration appears in autumn, and the minimum concentration appears in summer. When the classroom is unoccupied, indoor bacterial aerosol mainly comes from outside, through the gap of doors and windows, with the concentration from 57 to 664 cfu/m3, and without obvious seasonal change. When there are people in the classroom, indoor bacterial aerosol mainly comes from the human body, and its concentration is from 230 to 1 484 cfu/m3, which is significantly higher in summer than that in other seasons. The concentration of culturable bacterial aerosol is 3 526 cfu/person in summer, 2 374 cfu/person in autumn, 1 994 cfu/person in spring and 1 386 cfu/person in winter.