Concentration and size distribution of bioaerosols in indoor environment of university dormitory during the plum rain period

Bioaerosols of university dormitory can spread through air and cause a potential health risk for student staying in indoor environment. To quantify the characteristics of bioaerosols in indoor environment of university dormitory, concentration and size distribution of culturable bioaerosols were detected during the plum rain period,the correlations of culturable bioaerosol with concentration of particulate matter, the ambient temperature and relative humidity were analyzed using Spearman's correlation coefficient and finally the changes of size distribution of culturable bioaerosol caused by activities of students were detected. The results showed that the mean concentrations of culturable airborne bacteria and fungi were (2133±1617) CFU·m^-3 and (3111±2202) CFU·m^-3. The concentrations of culturable airborne bacteria and fungi exhibited negative correlation with PM₁, PM_2.5 and PM₁₀, respectively. The respirable fractions of bacteria exhibited positive correlation with PM_2.5, and the respirable fractions of fungi exhibited significant positive correlation with PM₁₀. Ambient temperature had positive correlation with culturable airborne bacteria and fungi, and relative humidity had negative correlation with culturable airborne bacteria and fungi. In the afternoon, concentrations of culturable airborne fungi in indoor environment of university dormitory significantly increased, and the size distribution of culturable bioaerosols was different in the morning and afternoon.