| during production | 16 | temporal |
| from their | 8 | location |
| from the gases | 4 | cause |
| hazard → can → occur | 20 |
| hazard → can → arise | 10 |
| hazard → be → possible | 7 |
| hazard → could → occur | 7 |
| hazard → could → arise | 5 |
| hazard → can → result | 5 |
| hazard → could → result | 5 |
| negative | neutral | positive |
| 0.513 | 0.424 | 0.062 |
| Raw frequency | 59 |
| Normalized frequency | 0.623 |
| Modifier score | 0.633 |
| Perplexity | 53.782 |