| Similarity | Rank | |
|---|---|---|
| gases | 0.878 | 11662 |
| Methane | 0.869 | 69623 |
| gasses | 0.857 | 45276 |
| hydrocarbons | 0.855 | 32458 |
| ethane | 0.843 | 97441 |
| hydrocarbon | 0.843 | 36213 |
| dioxide | 0.840 | 10273 |
| gaseous | 0.832 | 42339 |
| nitrogen | 0.801 | 12237 |
| CO2 | 0.793 | 9992 |
| sulfur | 0.790 | 22001 |
| ammonia | 0.786 | 21773 |
| biomass | 0.779 | 16091 |
| gasification | 0.776 | 64900 |
| gas | 0.773 | 1338 |
| sulphur | 0.771 | 34384 |
| GHGs | 0.770 | 91201 |
| sulfide | 0.769 | 49224 |
| NOx | 0.762 | 55787 |
| dioxins | 0.760 | 77636 |
| hydrogen | 0.760 | 9917 |
| PAHs | 0.759 | 93057 |
| pollutants | 0.756 | 16074 |
| sulphide | 0.755 | 82356 |
| particulates | 0.755 | 55487 |