Most viruses you have a risk of catching are enclosed in microdroplets which CAN be caught by a mask. On an unrelated topic, most scent molecules are not measured in microns In fact I doubt any are. Most scent molecules are actually much, much smaller than viruses. Ironically you've confused "spray particles" with the thing you actually sense. The "spray particles" that article is talking about are microdroplets. You know, the things that viruses are enclosed in. [Here](https://en.wikipedia.org/wiki/Rose_oxide#:~:text=Rose%20oxide%20is%20an%20organic%20compound%20of%20the,responsible%20for%20the%20typical%20rose%20%28floral%20green%29%20fragrance.), for instance, is the Wikipedia entry on the scent molecule of a rose. Masks don't stop every single virus, they drastically reduce the chance of transmission through respiration. Scents are detectable in very, very small percentages. But yes, a virus or ten will make it through a face mask. A smaller number of viruses is much less likely to result in a full infection.