- Environment, general 31
- Ecotoxicology 23
- Atmospheric Protection/Air Quality Control/Air Pollution 19
- Environmental Chemistry 19
- Waste Water Technology / Water Pollution Control / Water Management / Aquatic Pollution 19
- Environmental Health 18
- Soil Science & Conservation 5
- Environmental Physics 3
- Pollution, general 3
- Environmental Management 2
- Environmental Science and Engineering 2
- Analytical Chemistry 1
- Applied Ecology 1
- Climate Change/Climate Change Impacts 1
- Earth Sciences, general 1
- Ecology 1
- Geoecology/Natural Processes 1
- Geoengineering, Foundations, Hydraulics 1
- Geography, general 1
- Geotechnical Engineering & Applied Earth Sciences 1