From my experience @deni, they avoid peanut situations as best they can.
My aunt and cousin have to avoid eating, breathing and touching peanuts (my aunt has to avoid all legumes). When it fails, they have to pull out the Epi-pen.
The rest of my story is the same as @LuckyGuy.‘s
I will add that my aunt coded 5 times at the hospital after inhaling the aroma from cafeteria making peanut squares at the school she worked at (she went into the lunchroom to buy a milk). The EMTs finally had to use an infant breathing tube to stabilize her, as her throat had nearly swollen shut in the few moments it took them to get there. Had another co-worked not understood that my aunt needed her Epi-pen, she would have died in the school.
In the hospital, they informed family members that she was most likely not going to make it and brought in the grief counselor for them.
No, open air or not, people with peanut allergies cannot be around peanuts. The allergy can become more severe without the person’s knowledge.