It doesn't matter if you are six feet away, if the air breathed out by the other person hangs in the air, it is there for you to breathe when you advance to where he has been in the line.
Wearing masks might filter out some of the aerosol particles, but by the very nature of the masks being breathable, that they are so small of particles means some are going to not be stopped by the mask.
You have to whisk them away. And, an air system that goes horizontally only carries them to the next person. You need fans in the floor strong enough to force the air upward to a place in the ceiling where it is filtered and sent on its way.
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