| for life on earth | 8 | transitive-object |
| in drinking water application | 8 | other |
| for protecting biosphere | 5 | purpose |
| ozone → be → important | 17 |
| ozone → be → essential | 7 |
| ozone → be → crucial | 6 |
| ozone → be → critical | 5 |
| negative | neutral | positive |
| 0.191 | 0.501 | 0.308 |
| Raw frequency | 35 |
| Normalized frequency | 0.524 |
| Modifier score | 0.500 |
| Perplexity | 201.763 |