High-hazard Group H occupancies are characterized by a greater degree of explosion, fire, or health hazard than typical commercial and industrial uses. There is one common feature of Group H occupancies: they are designated as Group H because they contain excessive quantities of hazardous materials. Where the quantities of hazardous material stored or used in a building exceed those set forth in Section 307 (High-Hazard Group H), a Group H classification is warranted. On the other hand, where such quantities are not exceeded, a Group H classification is not necessary.