The development of powder manufacturing and processing technology has increased pulverization processes for combustible dusts. This led to the enhanced probability of dust explosion, but the current safety management system in Korea is only concerned with flammable solids, excluding combustible dusts. Such management structure was created by the introduction of the GHS system, followed by the revision of the regulations on combustible dusts to those on flammable solids. Since only a small number of combustible dusts are classified as flammable solids under the current criteria, most combustible dusts are under insufficient management. Thus, the continuing requests have been made for the management of combustible dust facilities and more stringent legal standards. This study suggested the improved legal standards for accident prevention by clarifying the definition and determination criteria for combustible dusts and identifying the items to be managed.