The more expensive aerosols can produce a very pleasant scent, but only for a few minutes and only in the immediate area where sprayed. Aera is what is known as a “continuous action” air freshener. Aera creates, maintains and evenly delivers scent effect continuously. This scent effect never overpowers due to the low concentrations of fragrance molecules emitted by Aera's patented technology. Unlike aerosol air fresheners, Aera emits fragrance without alcohol, propellants or other harmful VOCs.