| Typicality: | 0.457 |
| Saliency: | 0.486 |
| naturally | 6 | manner |
| for up to 114 years | 5 | temporal |
| nitrous oxide → remain in → the atmosphere | 5 |
| nitrous oxide → be present in → the atmosphere | 5 |
| nitrous oxide → be → a part of earth's atmosphere | 3 |
| nitrous oxide → occur in → the atmosphere | 3 |
| negative | neutral | positive |
| 0.237 | 0.650 | 0.112 |
| Raw frequency | 16 |
| Normalized frequency | 0.486 |
| Modifier score | 0.500 |
| Perplexity | 19.803 |