| at low concentrations | 5 | location |
| in the longer run | 3 | temporal |
| gas → cause → headache | 30 |
| gas → lead to → headache | 4 |
| gas → produce → headache | 4 |
| negative | neutral | positive |
| 0.926 | 0.067 | 0.007 |
| Raw frequency | 38 |
| Normalized frequency | 0.456 |
| Modifier score | 0.500 |
| Perplexity | 161.545 |