A small primary school in Brisbane's west has done what many others have been unable to achieve during COVID-19's Omicron wave in Queensland: remain outbreak-free.
They studied airflow patterns with a smoke machine, used an aranet4 to monitor CO2, and purchased air purifiers.
https://www.abc.net.au/news/2022-04-01/brisbane-school-no-covid-omicron-outbreaks-term-1/100956850