QT:{{”
To understand why screens often have little effect on protecting people from aerosol particles, it helps to think about exhaled breath like a plume of cigarette smoke, Dr. Marr said.
“One way to think about plastic barriers is that they are good for blocking things like spitballs but ineffective for things like cigarette smoke,” Dr. Marr said. “The smoke simply drifts around them, so they will give the person on the other side a little more time before being exposed to the smoke. Meanwhile, people on the same side with the smoker will be exposed to more smoke, since the barriers trap it on that side until it has a chance to mix throughout the space.” “}}
Another useful fact connected to this thread is that secondhand cigarette smoke is a good indicator of aerosol behavior
https://www.nhregister.com/opinion/article/Opinion-What-secondhand-smoke-tells-us-about-the-15794467.php viz: https://twitter.com/MarkGerstein/status/1430324404752318464
https://www.nytimes.com/2021/08/19/well/live/coronavirus-restaurants-classrooms-salons.html
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