- Atmospheric Protection/Air Quality Control/Air Pollution 14
- Waste Water Technology / Water Pollution Control / Water Management / Aquatic Pollution 12
- Ecotoxicology 11
- Environment, general 11
- Environmental Chemistry 10
- Environmental Health 10
- Ecology 3
- Environmental Management 3
- Forestry Management 2
- Nature Conservation 2
- Climate Change/Climate Change Impacts 1
- Hydrogeology 1
- Monitoring/Environmental Analysis 1
- Soil Science & Conservation 1
- Water Quality/Water Pollution 1