Environmental protection
- 13/13.020/13.020.01 Environment and environmental protection in general
- 13/13.020/13.020.10 Environmental management
- 13/13.020/13.020.20 Environmental economics
- 13/13.020/13.020.30 Environmental impact assessment
- 13/13.020/13.020.40 Pollution, pollution control and conservation
- 13/13.020/13.020.50 Ecolabelling
- 13/13.020/13.020.55 Biobased products
- 13/13.020/13.020.60 Product life-cycles
- 13/13.020/13.020.70 Environmental projects
- 13/13.020/13.020.99 Other standards related to environmental protection