| Similarity | Rank | |
|---|---|---|
| gases | 0.968 | 11662 |
| dioxide | 0.864 | 10273 |
| particulates | 0.860 | 55487 |
| methane | 0.857 | 19799 |
| gaseous | 0.839 | 42339 |
| vapors | 0.828 | 41277 |
| pollutants | 0.815 | 16074 |
| combustion | 0.813 | 15295 |
| CO2 | 0.812 | 9992 |
| fumes | 0.799 | 20241 |
| refrigerants | 0.798 | 92454 |
| soot | 0.797 | 34824 |
| hydrocarbons | 0.794 | 32458 |
| monoxide | 0.793 | 23477 |
| vapour | 0.791 | 35280 |
| contaminants | 0.783 | 17549 |
| vapours | 0.783 | 83502 |
| particulate | 0.779 | 32316 |
| nitrogen | 0.776 | 12237 |
| VOCs | 0.775 | 56195 |
| ammonia | 0.774 | 21773 |
| co2 | 0.773 | 72066 |
| aerosols | 0.768 | 54502 |
| NOx | 0.768 | 55787 |
| emissions | 0.767 | 4569 |