 |
| toxic substance: 58 phrases in 17 subjects |
| Aviation | 1 |
| Ecology | 11 |
| Energy industry | 2 |
| Environment | 3 |
| Fish farming pisciculture | 1 |
| General | 2 |
| Makarov | 7 |
| Medical | 10 |
| Nanotechnology | 2 |
| Natural resourses and wildlife conservation | 1 |
| Oil / petroleum | 1 |
| Oil and gas | 3 |
| Sakhalin | 1 |
| Security systems | 1 |
| Technology | 3 |
| Toxicology | 3 |
| Weapons of mass destruction | 6 |