Interesting little study linking the loss of smell that we all know comes with CoVid, to deposition of <5μm aerosols (fine) in the Olfactory Epithelium.
"we hypothesized that small concentrations of persistently airborne aerosols (those below 5μm) would be more prone to dispersing within the olfactory epithelium than the lower nasal airway. This selective olfactory dispersion of smaller-sized airborne particulate would
therefore provide a novel mechanism linking atypical olfactory dysfunction in COVID-19 with airborne transmission. "