Rule of thumb I try to use: if you can smell a fart for more than a few seconds, you probably don't have enough air movement.
I've had flights where someone near me was just carpet bombing me for hours, usually starting right after mealtime. I'd really not like for that person to have covid.
But I guess as long as we're both wearing masks, I'd feel better about my chances. Fart particles are a lot smaller than breath droplets.
I always seem to get sick after flying. But I always assume it's something already floating around in my nose or something - which gets stirred up when takeoff and landing are like taking a plunger to my sinuses. Plus the overall stress of flying.
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