Figure 4
From: A smart mask for active defense against airborne pathogens
Normalized PM concentration versus time for the particle size range 0.3–\(1.0\,\mu \hbox {m}\) in three cases: just outside the mask (bottom), within the mask with the mitigation module OFF (middle), and within the mask with the mitigation module ON (top). The mist generated by the mitigation module reduces the internal PM concentration by approximately \(6.5\times\).
