| particularly | 5 | degree |
| in smaller cities | 3 | location |
| according to a report | 3 | other |
| pollution → be → severe | 21 |
| pollution → become → severe | 4 |
| negative | neutral | positive |
| 0.758 | 0.194 | 0.049 |
| Raw frequency | 25 |
| Normalized frequency | 0.579 |
| Modifier score | 0.500 |
| Perplexity | 71.672 |