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Aqueous film-forming foam (AFFF) is primarily used in fires containing liquid flammables. The foam creates a blanket that cuts off the fuel from the oxygen it needs to burn, smothering the fire. Firefighters and navy personnel, and airport personnel are constantly exposed to this foam for training and emergencies.

Numerous types of cancer have been linked to exposure to firefighting foam that contains PFAS and this foam has led to contamination in several regions of the country. Lawsuits have been filed against the manufacturers alleging that these companies sold AFFF despite knowing that it was hazardous to humans and the environment.