During the Apollo missions, the astronauts donned their space suits inside the Apollo Lunar Module cabin, which was then depressurized to allow them to exit the vehicle. Upon the end of EVA, the astronauts would re-enter the cabin in their suits, bringing with them a great deal of dust which had adhered to the suits. Several astronauts reported a "gunpowder" smell and respiratory or eye irritation upon opening their helmets and being exposed to the dust.
[referenced article at Space.com, "Lunar Explorers Face Moon Dust Dilemma" by Leonard David]
I learn something new every day.
If you're not a shooter or firework afficianado, then you might not know what gunpowder smells like, but it's actually a very distinctive smell. I never thought I would hear that something smells like gunpowder other than actual gunpowder.
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