- Atmospheric Protection/Air Quality Control/Air Pollution 3
- Environment, general 3
- Ecotoxicology 2
- Environmental Chemistry 2
- Environmental Health 2
- Waste Water Technology / Water Pollution Control / Water Management / Aquatic Pollution 2
- Climate Change/Climate Change Impacts 1
- Hydrogeology 1
- Soil Science & Conservation 1
- Water Quality/Water Pollution 1