Air sampling in Dane County schools is helping health officials track flu and COVID-19, similar to how wastewater is increasingly monitored around the country for the coronavirus to gauge activity as fewer people get tested for COVID-19.

Since the beginning of the school year, flu and COVID-19 data from 16 air monitors at 15 schools in or near the county has been reported on Public Health Madison and Dane County’s respiratory illness dashboard. The devices, roughly the size of microwave ovens, are placed in communal spaces such as cafeterias. They suck air, including airborne viruses, into spongy material that is analyzed for viral genetic material.