Fumigation is a pest control method that uses gas to kill pests within an enclosed space. It involves sealing off the area and releasing a fumigant, a gaseous pesticide, which permeates every nook and cranny, reaching pests that are hidden in walls or flooring. A method for pest eradication. Treatments, including fumigation, comply with current Health and Safety legislation and COSHH. Mentioned in the context of flea fumigation, cockroach fumigation, and flat fumigation for bed bugs.