Clinging to suit, helmet, gloves, and tools of astronauts returning from space walks is a metallic odor, “pleasant sweet smelling welding fumes” says ISS Science Officer Don Pettit. nasa.gov/spacechronicles
We know what the moon smells like, too.
According to Apollo astronauts, moon dust “smells like spent gunpowder,” and tastes “not half bad.” nasa.gov/smellofmoondust
No one has sniffed Martian dust yet, at least not with a human nose.
But future missions “could take a spectroscopic reading of the Martian atmosphere, then beam that information back to Earth” where the molecules could be recreated for anyone to sniff.
Expect “sulfur, acids, magnesium, iron and chlorine compounds, all of which are sunbaked and wrapped in a carbon-dioxide-rich atmosphere.” scientificamerican.com/mars-smell-like
In my science fiction stories about the first colony on Mars, I started with the smell of the Moon and added metallic overtones. But it’s acrid, too. I’ve worked in oil refineries and in copper extraction plants – sulfur is a strong part of the smell in both places and not pleasant at all.
I wonder how close I got?
Read one of my books see for yourself. You’ll have to use your imagination instead of your nose for now.