- Environment, general 4
- Science, Humanities and Social Sciences, multidisciplinary 3
- Atmospheric Protection/Air Quality Control/Air Pollution 2
- Civil Engineering 2
- Data Mining and Knowledge Discovery 2
- Ecotoxicology 2
- Engineering Design 2
- Engineering, general 2
- Environmental Chemistry 2
- Environmental Health 2
- Information Storage and Retrieval 2
- Models and Principles 2
- Science, multidisciplinary 2
- Simulation and Modeling 2
- User Interfaces and Human Computer Interaction 2
- Waste Water Technology / Water Pollution Control / Water Management / Aquatic Pollution 2
- Algorithm Analysis and Problem Complexity 1
- Artificial Intelligence 1
- Atmospheric Sciences 1
- Automotive Engineering 1