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Air fresheners are products designed to reduce unwanted odors in indoor spaces, or to introduce pleasant fragrances, or both. 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.
There are many different types of air fresheners which deliver their active ingredients in different ways, including sprays, candles, gels, passive and active evaporating diffusers, atomizers, automatically timed metered aerosol dispensers, electric fan air fresheners, and plug-ins. Air fresheners are used in domestic and commercial settings and in both small and large spaces. Some air fresheners are produced for specific spaces and odors, such as car fresheners and urinal deodorizer blocks. Some air fresheners contain ingredients that provoke allergy and asthma symptoms or are toxic. Air freshening also can involve the use of organic and everyday household items.