Or you could say fog and rain. . . . But droplets drop pretty close by and airborne is much smaller and is suspended for several hours. Usually require a respirator to filter out (N95 or mask with p100 filter).A little exaggerated but I think it's a good one
Surgical masks do a good enough job to protect the wearer most of the time. So long as they are too crumpled up from being in your pocket, or not pulled over your face to actually filter your breathing.
EDIT: I think people should think of it in terms of exposure load rather than simply exposure.