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Imagine you have to spend some time indoors with a smoker, and your objective is to ensure that your spouse doesn’t notice the smell of cigarettes when you get back home.
If the room is poorly ventilated and you spend enough time inside it, your clothes will smell like cigarettes no matter how far from the smoker you sit. Social distancing is useless.
However, if the room is well-ventilated, and you sit far enough from the smoker, you might get away with your clothes not smelling like cigarettes much.
This is truer the less time you spend in the room.
In fact, the three variables (ventilation, social distance, and shortening exposure time) work together. If their product is high enough, your clothes will not get significantly smelly.
If you think of it in binary terms, all of this seems useless. No matter how good the ventilation and how far from the smoker you sit, some smoke particles will reach you.
But you don’t need to be free from all particles to win. You just need to avoid getting so many smoke particles that your spouse notices the smell.
The same applies to virus risk. The objective is not to inhale zero virus particles. The objective is to avoid inhaling so many virus particles that they can overwhelm your immune system.
And if the product of ventilation, social distancing, and reducing exposure time is high enough, you will keep the number of inhaled virus particles low enough that your immune system can fight it.
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