| certainly | 9 | manner |
| from cars | 7 | other |
| from the environment | 7 | other |
| pollution → be → generated | 29 |
| pollution → be → created | 9 |
| pollution → be → produced | 7 |
| pollution → be → form | 4 |
| pollution → be → made | 3 |
| negative | neutral | positive |
| 0.519 | 0.374 | 0.106 |
| Raw frequency | 52 |
| Normalized frequency | 0.779 |
| Modifier score | 0.500 |
| Perplexity | 115.936 |