It's pretty sure vented since it's got that big silver hose going into a wall which I'm assuming leads out of the unit. .
Yes, I live with a major 4 lane road in front of me and a highway next to me.
One lady did say she bought a new washer and dryer claiming it helped a lot but not entirely. I can't justify spending the money unless it was really worth it.
I guess I will just invest in a new vaccum cleaner and more expensive furnace filters.