To provide a method and a system for fighting a fire in which there is mobility, a fire can be rapidly controlled when the fire occurs in unopening space, further the survival of a person within the space is not adversely affected, faster first aid is conducted by providing such atmosphere environment that fire fighting and rescue members can rapidly enter fire space, and fire fighting can be conduced with a smaller amount of a fire extinguisher.

By utilizing an art of producing nitrogen enriched air from air in the actual spot of fire fighting work, an art of controlling the flow and oxygen concentration according to the kind of a fire, an art of controlling the injection of the nitrogen enriched air into fire space and a flow, an art of moving a device, and an art of monitoring a fire state, environment is provided that a fire is controlled and rescue and other fire fighting activity can be rapidly conducted by replacing atmosphere of space for fire fighting with atmosphere that a fire can be controlled and a person can also survive by injecting a large amount of the nitrogen enriched air having appropriate oxygen concentration.