If something is stoury, it means it is dusty, dirty, or full of flying bits of stuff.
Stoury things can make people feel like they need to clean or that they can't breathe well.
Examples:
The old attic is very stoury.
After playing outside, my clothes are stoury.
The stoury air made it hard to see.
I don't like going in the stoury basement.
The stoury wind blew sand in my eyes.
The stoury room made me sneeze a lot.