| for human health | 6 | transitive-object |
| in a coal mining environment | 5 | location |
| for safety | 4 | purpose |
| chemical → cause → concern | 13 |
| chemical → raise → concern | 12 |
| chemical → raised → concern | 5 |
| negative | neutral | positive |
| 0.698 | 0.277 | 0.025 |
| Raw frequency | 30 |
| Normalized frequency | 0.383 |
| Modifier score | 0.500 |
| Perplexity | 240.779 |