When airbrushing you atomise paint particles and vapour into the air. Whether you are using water-based paints or solvent-based paints, these should not be inhaled.

Protect yourself by using a spray booth that will draw all the paint vapours and particles through a filter and then expel them outdoors via a vent hose. The flexi vent hose can then be simply placed through a partially open window to keep your work area free from airborne contaminants.