Air fresheners or air care products are products that deliver ambient fragrance substances, which serve to mask or remove perceived unpleasant odours or to create a pleasant ambiance due to the presence of perceived nice smells .
Most air fresheners don't actually kill a bad smell. Rather than remove the smell from the room, masking fresheners simply cover a bad smell with another scent, which appears more pleasant to our senses.
They typically emit fragrance to mask odors but may use other methods of action such as absorbing, bonding to, or chemically altering compounds in the air that produce smells, killing organisms that produce smells, or disrupting the sense of smell to reduce perception of unpleasant smells.