I think we're being a wee bit obsessive about this issue.
There will always be dust in the air. But, to minimize the chances, don't clean near any source of draft, like a forced air heating duct. I suppose a room like a seldom used guest bedroom might have less stirred up dust than actively used rooms.
I meant this as a reply to the OP, not Joseph. However, Joseph, do you really think it's a good idea to open up a camera in a steamy bathroom? I wouldn't.