An aerosol consists of a misty liquid that you spray into the air.
In dreams, water often represents the emotions so spraying an aerosol in a dream can signify freeing repressed emotions.
Spraying an aerosol into the air can symbolize a desire to reach a higher, spiritual level.
If the aerosol in your dream makes something dirty or makes you cough or choke, you may be behaving in a way that is affecting you negatively in waking life.
The type of aerosol in your dream can be significant. For example, if you dream about an aerosol hairspray, you may be concerned with the way that others perceive you. If you dream of an aerosol air freshener, you may feel that something in your waking life stinks.