2022 Yes https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9538906/ Yang, Jun I. L. Asia Exposure Study Elementary (K-5) Temperature Humidity Particulate Matter (PM) Bioaerosol Disinfection NGS Particulate matter (PM) QPCR lassrooms disinfected with spray ≤1 week before sampling had lower bacterial DNA concentration (3116 DNA copies/m3) than those >1 week (5003 copies/m3) (p-values = 0.06). The bacterial DNA copy number concentration increased with temperature and was higher in classrooms in coastal than inland cities (p-values <0.01). Bacterial diversity in outdoor air was higher in coastal than inland cities while outdoor fungal diversity was higher in inland than coastal cities. These outdoor microbiomes affected classroom microbial diversity but bacterial community composition at the genus level in occupied classrooms were similar between coastal and inland cities.