Disinsection is carried out year round, and passengers are notified of the procedure via an on-board announcement prior to spraying of the cabin. This gives passengers the opportunity to cover their eyes and noses if they wish. The spray dissipates from the cabin and aircraft in a few minutes.
The content of the spray used by Air Canada is designated by the World Health Organization (WHO), and contains either 2% Permethrin or 2% d-Phenothrin. The remainder of the spray consists of HFA 134A as a propellant. The solvent and propellant currently in use are designed to be non-ozone depleting.
Note: A WHO expert committee on the safe use of pesticides has agreed there is no evidence that these insecticides present any toxic hazard to the passengers or crew, provided the correct procedures are followed. The Human Resources Development Canada Report “Comparative Toxicity of Permethrin and d-Phenothrin with Pyrethrum” found similar results.