- Ecotoxicology 4
- Terrestrial Pollution 4
- Atmospheric Protection/Air Quality Control/Air Pollution 3
- Biochemistry, general 2
- Environment, general 2
- Environmental Chemistry 2
- Environmental Engineering/Biotechnology 2
- Environmental Health 2
- Microbiology 2
- Monitoring/Environmental Analysis 2
- Pollution, general 2
- Soil Science & Conservation 2
- Waste Water Technology / Water Pollution Control / Water Management / Aquatic Pollution 2
- Analytical Chemistry 1
- Applied Ecology 1
- Atmospheric Sciences 1
- Biotechnology 1
- Characterization and Evaluation of Materials 1
- Environmental Management 1
- Food Science 1