Fragrances have been used to mask odors since the dawn of times. A variety of ingredients have been used over the time for their abilities to either create pleasant aromas or to eliminate undesirable odors.
The first modern air freshener, as we know it, was introduced in 1948. Its original function was based on a military technology for dispensing insecticides. It was adapted into a pressurized spray using a propellant. The idea behind the product was to deliver a fine mist of aroma compounds to remain suspended in the air for an extended period of time. The air freshener was born and this first type of dispenser became the industry standard.
In the 1980s, the air freshener market shifted away from aerosols, due to concerns over the destruction of the ozone layer. Many other air freshener delivery methods have become popular since, including scented candles, solid gels, reed diffusers, liquid wick air fresheners, potpourri, and heat release air freshening products such as scented oils.