First, air fresheners are consumer products that mitigate unpleasant odors in indoor spaces. They come in many different forms. Global retail sales of air care products were valued at more than $6 billion in 2006 and are forecast to reach $7.3 billion by the end of 2010.
The first modern air freshener was introduced in 1948. Its function was based on a military technology for dispensing insecticides and adapted into a pressurized spray using a chlorofluorocarbon (CFC) propellant. The product delivered a fine mist of fragrant compounds that would remain suspended in the air for an extended period of time. This type of product became the industry standard and air freshener sales experienced tremendous growth. In the 1950s, many companies began to add chemicals that counteract odors to their fragrance formulas. These chemicals, intended to neutralize or destroy odors, included unsaturated esters, pre-polymers, and long-chain aldehydes.(1)
In the 1970s, the air freshener market shifted away from aerosols, due to concerns over the destruction of the ozone layer by chlorofluorocarbons (CFCs). Many other air freshener delivery methods have become popular since, including scented candles, reed diffusers, potpourri, and heat release products.(1)
(1) Source: www.wikipedia.org
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Far and away from these things… harmful for the whole body… if someone needs to refresh somehow a room, better burn in the special burner they come with natural essential oils (the ones you add some drops in water) otherwise… nothing