03 Jul 2018 --- Food safety regulators are highlighting potential contamination issues as food business operators try to manage their carbon dioxide supply amid a shortage in the gas. The possible food safety issues can relate to the quality of “food grade” carbon dioxide, as CO2 can be a potential source of contamination in food. Therefore, carbon dioxide used in food or in contact with food must be fit for purpose, says both the Food Standards Agency of the UK and Ireland.