Generally medical gases are administered or supplied directly to the patients. They should be monitored as required by the respective regulatory authorities of every country or via a central line which runs through the entire hospital. They should be manufactured and transferred with the highest quality possible as per standards and limits decided by the different regulatory authorities. For the manufacturing of the medical gases manufacturer needs to issue license (or regulatory approval) hence they justify about maintaining quality of the gases as standard/limitation regarding quality decided by the drug regulatory authorities.