I would try to get a spot near the door if possible. I think you'd get more fumes sitting in traffic for 20 minutes IMHO. As long as you don't inhale intentionally but i think you have more sense then that.
I had my nails done until I reached 3rd trimester. (The only reason I stopped then was I didn't want to have to worry about maintaining them with a newborn). One of the girls was pregnant at the same time so I used to get her to do my nails because she was closest to the door and had a fan next to her to disperse the fumes. The fumes weren't too good for morning sickness though.
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