- Environmental Science and Engineering 10
- Ecotoxicology 9
- Geology 9
- Environmental Chemistry 6
- Soil Science & Conservation 6
- Biogeosciences 5
- Environment, general 5
- Geochemistry 5
- Hydrology/Water Resources 5
- Terrestrial Pollution 5
- Waste Water Technology / Water Pollution Control / Water Management / Aquatic Pollution 5
- Monitoring/Environmental Analysis 4
- Atmospheric Protection/Air Quality Control/Air Pollution 3
- Ecology 3
- Environmental Management 3
- Computer Communication Networks 2
- Characterization and Evaluation of Materials 1
- Clinical Nutrition 1
- Communications Engineering, Networks 1
- Electrical Engineering 1