2021 Yes https://onlinelibrary.wiley.com/doi/full/10.1111/ina.12822 Salin, Janne Europe Observational Teachers Dust Bacteria Respiratory symptoms Hearing Vision Stress/Anxiety Building related symptoms Indoor toxicity Microbial toxins Mitochondrial dysfunction Mitochondrial toxicity Sick building syndrome A negative binomial mixed model showed that teachers’ work-related nBRS were 2.9-fold (95% CI: 1.2-7.3) higher in classrooms with highly toxic dust samples compared to classrooms with non-toxic dust samples (p = 0.024). The RR of work-related nBRS was 1.8 (95% CI: 1.1-2.9) for toxic microbial samples (p = 0.022).