- Atmospheric Protection/Air Quality Control/Air Pollution 16
- Atmospheric Sciences 7
- Climate Change/Climate Change Impacts 5
- Environment, general 5
- Hydrogeology 5
- Soil Science & Conservation 5
- Water Quality/Water Pollution 5
- Environmental Management 2
- Monitoring/Environmental Analysis 2
- Public Health 2
- Applications of Graph Theory and Complex Networks 1
- Data-driven Science, Modeling and Theory Building 1
- Ecotoxicology 1
- Environmental Physics 1
- Geophysics and Environmental Physics 1
- Math. Appl. in Environmental Science 1
- Meteorology 1
- Noise Control 1
- Physical Chemistry 1