Pig gas chambers in Victoria use carbon dioxide from either Air Liquide or BOC, Australia’s largest suppliers of CO2. Carbon dioxide is a colourless gas which is used in many sectors including food, construction and storage. Although non-toxic, when breathed in by humans and animals, CO2 can become a powerful asphyxiant. Exposure to CO2 can produce a variety of health effects, including headaches, dizziness, restlessness, a tingling or pins or needles feeling, difficulty breathing, sweating, tir