The Odor Free device could take the form of a diffuser attached to the central air vent.

This device could offer a new solution to removing odour in cars, inhibiting the smell rather than overpowering it with another smell. — AFP Relaxnews

The automotive supplier Valeo has introduced Odour Free, the first neuroscience-based odour neutraliser for cars.

This system is based on the diffusion of a "neutral" fragrance, which inhibits the perception of unpleasant odours in the passenger compartment.