Do not put full or partially full aerosol cans in the trash or recycling; they may explode in the compactor truck and harm sanitation workers. Aerosol cans containing propellant are explosive if crushed or incinerated. Full or partially full aerosol cans should be disposed of at a household hazardous waste collection event.
Empty aerosol cans may be recycled curbside. Aerosol containers are generally made of steel, which is easily recycled curbside when empty. The best approach with aerosols is to completely use up the contents of the can, including the propellant. An aerosol can is empty when you no longer hear any air released when the nozzle is depressed and the can feels empty when shaken. To empty an aerosol can of its non-hazardous contents, discharge outdoors into a deep cardboard box or paper bag, and allow the box or bag to dry before placing in the recycling bin.