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August 20th, 2021 
Awake Goy 
According to Dr. Marr of VT, “One way to think about plastic barriers is that they are good for blocking things like spitballs but ineffective for things like cigarette smoke,” adding “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.”
Those who may be at least partially protected by a plastic barrier include bus drivers, bank cashiers, or doctor’s office clerks, whose barriers are often substantial.
“If there are aerosol particles in the classroom air, those shields around students won’t protect them,” said UC Davis incoming dean of engineering, Richard Corsi. “Depending on the air flow conditions in the room, you can get a downdraft into those little spaces that you’re now confined in and cause particles to concentrate in your space.“
The problem, experts say, is that most people in charge of erecting barriers in offices, restaurants, nail salons and schools are not doing so with the assistance of engineering experts who can evaluate air flow and ventilation for each room. -NYT
“Air flow in rooms is pretty complicated,” said Corsi. “Every room is different in terms of the arrangement of the furniture, the height of the walls and ceilings, the vents, where the book shelves are. All of these things have a huge impact on the actual flow and air distribution in a room because every classroom or office space is different.“
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