- Waste Water Technology / Water Pollution Control / Water Management / Aquatic Pollution 4
- Environmental Chemistry 3
- Geology 3
- Geophysics/Geodesy 3
- Hydrogeology 3
- Hydrology/Water Resources 3
- Water Quality/Water Pollution 3
- Ecotoxicology 2
- Pollution, general 2
- Science, Humanities and Social Sciences, multidisciplinary 2
- Science, multidisciplinary 2
- Analytical Chemistry 1
- Atmospheric Protection/Air Quality Control/Air Pollution 1
- Environment, general 1
- Environmental Health 1
- Geochemistry 1
- Geoecology/Natural Processes 1
- Geoengineering, Foundations, Hydraulics 1
- Geotechnical Engineering & Applied Earth Sciences 1
- Medicine/Public Health, general 1