Aerosols are more of a packaging product form than a specific formulation type. You could actually create an aerosol out of almost any cosmetic formulation if you have the right can, propellant, and nozzle set-up. Aerosols are any cosmetic delivered from a pressurized can. They are composed of a concentrate and a propellant. You first make the formula as you would any other cosmetic, then fill it into the can. You seal the can and pressurize it using the appropriate propellant. Recent VOC (volatile organic compounds) regulations have reduced the use of aerosols in cosmetic products.