| Typicality: | 0.519 |
| Saliency: | 0.250 |
| from harmful pollutants | 2 | transitive-object |
| requirement → protect → public health | 13 |
| requirement → be designed to protect → public health | 3 |
| requirement → safeguard → public health | 3 |
| negative | neutral | positive |
| 0.129 | 0.649 | 0.222 |
| Raw frequency | 19 |
| Normalized frequency | 0.250 |
| Modifier score | 1.000 |
| Perplexity | 99.331 |