- Atmospheric Protection/Air Quality Control/Air Pollution 10
- Environment, general 10
- Environmental Chemistry 10
- Environmental Health 10
- Ecotoxicology 9
- Waste Water Technology / Water Pollution Control / Water Management / Aquatic Pollution 9
- Geotechnical Engineering & Applied Earth Sciences 6
- Geoecology/Natural Processes 4
- Geoengineering, Foundations, Hydraulics 4
- Nature Conservation 4
- Science, Humanities and Social Sciences, multidisciplinary 3
- Earth Sciences, general 2
- Engineering, general 2
- Geochemistry 2
- Hydrogeology 2
- Hydrology/Water Resources 2
- Soil Science & Conservation 2
- Terrestrial Pollution 2
- Algorithm Analysis and Problem Complexity 1
- Artificial Intelligence 1