As used in this chapter, “emergency” means the actual or threatened existence of conditions of disaster or of extreme peril to the safety of persons and property within the city caused by such conditions as air pollution, fire, flood, storm, epidemic, riot or earthquake, or other conditions, including conditions resulting from war or imminent threat of war, but other than conditions resulting from a labor controversy, which conditions are or are likely to be beyond the control of the services, personnel, equipment and facilities of the city, requiring the combined forces of other political subdivisions to combat. (Ord. 321 § 2, 1973).