Where are Nitrogen Generators used? Atmospheric air comprises seventy-eight percent of nitrogen, twenty-one percent of oxygen, and one percent of other gases. Nitrogen finds its use in various industries like food packaging and mining. These industries require a constant supply of nitrogen. Some industries use nitrogen cylinders, but these cylinders are not easy to transport and are expensive. Industries use on-site nitrogen gas generators to meet their nitrogen supplies. Nitrogen generators produce pure nitrogen by separating it from oxygen and other gas molecules.