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Ranking categories based on the frequency of published documents.
| Ranking | Categories | Frequency |
|---|---|---|
| 1 | Energy Fuels | 24,875 |
| 2 | Engineering Chemical | 12,743 |
| 3 | Biotechnology Applied Microbiology | 10,077 |
| 4 | Environmental Sciences | 9141 |
| 5 | Green Sustainable Science Technology | 6554 |
| 6 | Agricultural Engineering | 5800 |
| 7 | Engineering Environmental | 4323 |
| 8 | Chemistry Physical | 3254 |
| 9 | Chemistry Multidisciplinary | 3.247 |
| 10 | Thermodynamics | 3179 |
