Distribution and influencing factors of fungal aerosol concentration in residential buildings in Chongqing

 In order to study the distribution and influencing factors of fungal aerosol concentration in residential buildings in Chongqing in different seasons, 23 residences are selected for indoor and outdoor fungal aerosol concentration detection and temperature and humidity measurement. The results show that during the test period, the average indoor fungal aerosol concentrations in summer, transition season and winter are 1 655.8, 1 412.8, 465.9 cfu/m3, respectively. The concentrations in summer and transition season are significantly higher than that in winter. The peak and count median diameters of indoor fungal aerosol are in the fourth level (2.10 μm, 3.30 μm］, the fourth level particle size accounts for the largest proportion and the count median diameter is the smallest in winter. Indoor fungal aerosol concentration is significantly positively correlated with outdoor concentration, indoor temperature and relative humidity, the significance level P is less than 0.01, and the Spearman correlation coefficients are 0.799, 0.533 and 0.574, respectively. The average annual I/O ratio is 1.25, which shows that the concentration of indoor sources is higher than that of outdoor sources.