We used to buy air fresheners to spray in the living room once in a while. But when we acquired dogs that stayed inside the house, we stopped that practice for the spray and the scent might be toxic to the dogs. Our air freshener now is the pandan leaves. It is not an herb but a plant with aromatic leaves. We harvest some 5 to 10 leaves that we place in an empty vase that would exude a fresh scent in the living room.