This article scares me. I am one of those people like Mac's DS that will get itchy lips, a runny nose, monster headache, anxiety, and/or itchy eyes when people eat my allergens near me (within a metre guaranteed, even outdoors, possibly further indoors.) According to my current action plan, any more than one of those symptoms means EpiPen! Thankfully, my asthma hasn't ever reacted in those situations, but I wouldn't want to risk that either.
I think this is another study that focuses on the 95% of people with food allergies that have thresholds high enough for public places not to be bothersome. Which means it makes the remaining 5% of us look like crazy people.
I fly to America is less than a week. I travel in long pants, long sleeves, a hooded jacket, and closed toe shoes and often still end up with a few hives from *something* in the airports. This time I am taking a N95 mask too, As the airline I am flying with sells snacks with nuts and potato crisps, but doesn't give them out for free. (It is only a 30-minute flight with that airline, so I deemed the risk to be fairly low.)