Cut one or two big yellow onions into chunks. Put the chunks on dishes, and place the dishes around the room. They will absorb the paint smell. (By the way, don’t keep the onions out for more than a day, or you’ll need something to get rid of the obnoxious onion smell.)
Charcoal briquettes placed around the room will also help absorb paint smells. So will a few plates or cookie trays filled with a layer of table salt.
More ways to clear the air…