Aerosol Transmission has finally been recognized by the CDC, with some ominous implications that haven't really been properly addressed at all. For those interested in learning more on aerosols, the best paper I've seen is from Jose-Luis Jimenez, PhD. I've attached this as a pdf, but MedScape featured this with comments and answers from Dr Jimenez which you may wish to read here:
https://www.medscape...warticle/934837
COVID-19 Data Dives: Why Arguments Against SARS-CoV-2 Aerosol Transmission Don't Hold Water
My favorite comment was MINE, on vocalization generating far more aerosol than simply breathing, to which Dr Jimenez replied directly: "Dear Bill, I agree with you. In fact something we have been repeating is that whoever is talking, is the most important person in terms of wearing a mask. The emissions of respiratory particles increase a factor of 10 when talking vs. just breathing, and more so for talking loudly."
Dr Jimenez also states in his paper: "Although data are scarce, we suspect that aerosols in the range of 1-10 µm produced in speech (not coughing or sneezing) dominate aerosol transmission of SARS-CoV-2."
When I'm out & about, I don't look for people who aren't wearing masks; I LISTEN for people who are talking, and change course accordingly. Why is this little secret not being spilled to the public.
I've seen some sad examples of what passes for masks now days. Face shields? Neck Gaiters? Bandanas? Or my favorite, the reusable cloth mask with ear loops so stretched out the mask hangs open at the top. These halfhearted attempts at complying may stop some droplets from hitting you in the face, but when it comes to aerosols they are essentially worthless.
Dr Jimenez does point out although many aerosols are small enough to pass through the pours of a standard surgical mask, they do appear to trap a substantial percentage of aerosols. "It is often stated than only N95 masks can stop most aerosols. This is true for pollution aerosols, with a typical size of 0.3 µm. But aerosols in the supermicron range are reasonably well filtered by wellworn surgical masks". "The authors discuss several studies conducted in hospital environments that examined the effectiveness of N95 vs surgical masks in reducing transmission. Some studies did report that N95 masks provided better protection, while others found no difference. The authors favor the latter studies and take those results as evidence against the importance of aerosol transmission. However, they fail to consider that those masks may not be that different for the supermicron particle size range that is probably most relevant to SARS-CoV-2 transmission, especially when accounting for the imperfect fit of N95 masks for some users in the real world."
Apparently many aerosols are sticking to mask fibers they bump into as they pass through the filter material. This said, the mask in question would have to be tight enough against the face to force exhaled breath through the filter material, with no gaps to provide an escape route.
Any government serious about mask mandates or even guidelines should be taking into account the only "real" mask that would realistically control aerosols would have to be a tri-layer disposable surgical mask changed daily, or the more high tech N-95+ or filter respirator. Anything less is just for show.