- Science, Humanities and Social Sciences, multidisciplinary 182
- Environment, general 166
- Science, multidisciplinary 154
- Environmental Chemistry 150
- Atmospheric Protection/Air Quality Control/Air Pollution 133
- Waste Water Technology / Water Pollution Control / Water Management / Aquatic Pollution 127
- Ecotoxicology 126
- Artificial Intelligence 124
- Biotechnology 124
- Environmental Health 123
- Materials Science, general 115
- Characterization and Evaluation of Materials 105
- Nanotechnology 100
- Life Sciences, general 99
- Biochemistry, general 94
- Microbiology 94
- Physical Chemistry 89
- Earth Sciences, general 88
- Ecology 87
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