High-hazard Group H occupancies are characterized by an unusually high degree of explosion, fire, or health hazard compared to typical commercial and industrial uses. There is one common feature about Group H occupancies—they are designated as Group H based on excessive quantities of hazardous materials within the facility/building. Where the quantities of hazardous material stored or used in a building exceed their Maximum Allowable Quantity (MAQ), a Group H classification is necessary. On the other hand, where such quantities are not exceeded, a Group H classification is not required.