| 13020 | Environmental protection |
| 13030 | Wastes |
| 13040 | Air quality |
| 13060 | Water quality |
| 13080 | Soil quality. Pedology |
| 13100 | Occupational safety. Industrial hygiene |
| 13110 | Safety of machinery |
| 13120 | Domestic safety |
| 13140 | Noise with respect to human beings |
| 13160 | Vibration and shock with respect to human beings |
| 13180 | Ergonomics |
| 13200 | Accident and disaster control |
| 13220 | Protection against fire |
| 13230 | Explosion protection |
| 13240 | Protection against excessive pressure |
| 13260 | Protection against electric shock |
| 13280 | Radiation protection |
| 13300 | Protection against dangerous goods |
| 13310 | Protection against crime |
| 13320 | Alarm and warning systems |
| 13340 | Protective equipment |
