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Timing is critical in this situation. You may also be able to make use of the time during which the doors are opening and closing, depending on the condition of the elevator and how loud this function may be. This is only if you can smell your fart, however.
Get your timing right. Be sure to emit only small bursts as floors are reached and the electronic indicator emits the beeping noise. Be sure to show subtle signs of disgust as if the people who have entered the elevator are those who are emitting a foul smell. If all else fails, get out of the elevator and take the stairs.