Figure 5
From: A smart mask for active defense against airborne pathogens
Normalized aerosol concentrations detected by four PM sensors (#1–#4) at different heights as a function of time, interpolated to three different levels (\(L_1\), \(L_2\), and \(L_3\)). PM Sensor 1 is placed at 103cm, PM Sensor 2 at 77cm, PM Sensor 3 at 53cm and PM Sensor 4 at 28cm from the ground. (a) Only the humidifier is turned ON, showing the presence of an aerosol cloud at level \(L_1\) up to \(\sim 80\,\hbox {s}\). (b) Both the humidifier and mitigation module are turned ON, causing the aerosol cloud to settle to the ground within 20 s.
