- Atmospheric Protection/Air Quality Control/Air Pollution 27
- Ecotoxicology 27
- Physical Chemistry 18
- Environmental Engineering/Biotechnology 16
- Environmental Management 16
- Environment, general 14
- Environmental Chemistry 11
- Environmental Health 11
- Human Resource Development 11
- Innovation/Technology Management 11
- Organization 11
- Sustainability Management 11
- Waste Water Technology / Water Pollution Control / Water Management / Aquatic Pollution 11
- Science, Humanities and Social Sciences, multidisciplinary 6
- Science, multidisciplinary 6
- Biochemistry, general 4
- Freshwater & Marine Ecology 3
- Plant Sciences 3
- Agriculture 2
- Anesthesiology 2