Aviation Occupational Health and Safety Regulations

5.17 (1) Subject to subsection (2), the concentration of an airborne chemical agent or combination of airborne chemical agents on board an aircraft shall be less than 50% of the lower explosive limit of the chemical agent or combination of chemical agents.

(2) If a source of ignition may ignite an airborne chemical agent or combination of airborne chemical agents on board an aircraft, the maximum concentration of the chemical agent or of the combination of chemical agents shall be 10% of the lower explosive limit of the chemical agent or combination of chemical agents.