- Environment, general 27
- Environmental Health 19
- Ecotoxicology 13
- Soil Science & Conservation 12
- Atmospheric Protection/Air Quality Control/Air Pollution 11
- Ceramics, Glass, Composites, Natural Materials 10
- Environmental Chemistry 10
- Environmental Engineering/Biotechnology 10
- Fossil Fuels (incl. Carbon Capture) 10
- Renewable and Green Energy 10
- Waste Water Technology / Water Pollution Control / Water Management / Aquatic Pollution 9
- Ecology 8
- Agriculture 7
- Occupational Medicine/Industrial Medicine 7
- Public Health 7
- Earth Sciences, general 5
- Environmental Management 3
- Pollution, general 3
- Analytical Chemistry 2
- Animal Physiology 2