| in a case | 8 | location |
| very | 7 | degree |
| pollution → be → serious | 17 |
| pollution → be → serious problem | 12 |
| pollution → be → serious issue | 4 |
| pollution → pose → problem | 4 |
| pollution → present → serious problem | 4 |
| negative | neutral | positive |
| 0.716 | 0.259 | 0.026 |
| Raw frequency | 41 |
| Normalized frequency | 0.714 |
| Modifier score | 0.500 |
| Perplexity | 279.147 |