Answer:
plastic bags
food wrappers
Explanation:
these are the two things that pollute the air.
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If revealing your piercings during travel is unacceptable, wear nonmetallic jewelry. Quality metal body jewelry is non-ferromagnetic and will not set off the large walk-through metal detectors. ... You can still wear your metal piercing jewelry when you travel, and the TSA will not ask you to remove them.
Alcohol use. I know for a fact that that's the answer.
