Clostridioides difficile Enterococcus spp Humanities MRSA Social interaction Staphylococcus aureus air cleaner air quality antimicrobial resistance bacterial aerosol (BA) biological air pollutants decentralized façade ventilation fungal aerosol fungi gymnastic hall heterotrophic bacteria indoor air indoor air quality indoor microclimate life cycle assessment mannitol-positive staphylococci microbiological contamination microbiological indoor air quality (MIAQ) multi-antibiotic resistance (MAR) radiant catalytic ionization size distribution