- Environmental Chemistry 6
- Ecotoxicology 5
- Atmospheric Protection/Air Quality Control/Air Pollution 4
- Environment, general 4
- Environmental Health 4
- Microbial Genetics and Genomics 4
- Waste Water Technology / Water Pollution Control / Water Management / Aquatic Pollution 4
- Biotechnology 3
- Ecology 3
- Microbiology 3
- Biogeosciences 2
- Environmental Management 2
- Freshwater & Marine Ecology 2
- Geochemistry 2
- Hydrology/Water Resources 2
- Life Sciences, general 2
- Science, Humanities and Social Sciences, multidisciplinary 2
- Science, multidisciplinary 2
- Zoology 2
- Analytical Chemistry 1