| around schools | 5 | location |
| naturally | 3 | manner |
| as the result of human activities | 3 | cause |
| lead → be found in → air | 19 |
| lead → be found in → the air | 6 |
| lead → be present in → air | 4 |
| negative | neutral | positive |
| 0.660 | 0.318 | 0.022 |
| Raw frequency | 29 |
| Normalized frequency | 0.341 |
| Modifier score | 0.500 |
| Perplexity | 77.250 |