In our study we did not find a correlation between airborne
PM2.5 and fungal concentration (r¼ 0.04, p ¼ 0.83). In previously
conducted studies particle-size intervals of fungi present in indoor
air have been reported mostly within the upper limit of 4.7 mm in
diameter [38,47]. Another study has quantified size-resolved fungal
concentrations collected under both an occupied and a vacant state in a school classroom [43]. In both states PM number was increased
predominately in the 3e5 mmrange. It is most likely that the uppersize
limit of the PM collected in our study (i.e. 2.5 mm in diameter)
was unable to include the entire size range of fungi mass.