For this purpose, known substances (such as DEH) are placed at different positions in the room. Using six concentration curves determined over time, the infection risks at these positions can thus be calculated with spatial and temporal resolution.
The goal of the investigations is to develop a standardized test procedure for air purifiers. This would make it possible to evaluate the effectiveness of the devices in the room: both against particles or fine dusts in general and against infectious agents such as viruses. Other relevant parameters, such as energy consumption and noise emissions, could also be accurately evaluated using such standardized testing. A medium-term goal would be to transfer the findings into the form of a device label.Lukas Siebler, deputy head of the working group, explains: "The AQ Guard is particularly convincing due to its price-performance ratio. It allows us to take measurements with several devices despite a limited project budget. Furthermore, we are able to estimate the probability of infection in a room with different ventilation measures in a location- and time-resolved manner."