| Similarity | Rank | |
|---|---|---|
| particulate | 0.935 | 32316 |
| pollutants | 0.889 | 16074 |
| contaminants | 0.886 | 17549 |
| gasses | 0.860 | 45276 |
| gases | 0.857 | 11662 |
| VOCs | 0.854 | 56195 |
| oxides | 0.839 | 42880 |
| dioxide | 0.838 | 10273 |
| particles | 0.836 | 7018 |
| contaminant | 0.829 | 45441 |
| pollutant | 0.817 | 41997 |
| sulfide | 0.811 | 49224 |
| ammonia | 0.810 | 21773 |
| contaminates | 0.799 | 75535 |
| aerosols | 0.799 | 54502 |
| sulfur | 0.793 | 22001 |
| soot | 0.792 | 34824 |
| vapors | 0.788 | 41277 |
| dioxins | 0.784 | 77636 |
| gaseous | 0.783 | 42339 |
| impurities | 0.782 | 24506 |
| NOx | 0.780 | 55787 |
| nitrogen | 0.780 | 12237 |
| PAHs | 0.779 | 93057 |
| chlorine | 0.778 | 17545 |