 |
| hazardous material: 25 phrases in 15 subjects |
| Aviation | 1 |
| Construction | 1 |
| Ecology | 1 |
| Energy industry | 3 |
| Environment | 1 |
| Firefighting and fire-control systems | 4 |
| General | 3 |
| Logistics | 1 |
| Military | 3 |
| Oilfields | 1 |
| Security systems | 2 |
| Technology | 1 |
| United States | 1 |
| Water supply | 1 |
| Weapons of mass destruction | 1 |