| Similarity | Rank | |
|---|---|---|
| particulates | 0.935 | 55487 |
| NOx | 0.828 | 55787 |
| oxides | 0.828 | 42880 |
| pollutant | 0.825 | 41997 |
| pollutants | 0.822 | 16074 |
| contaminants | 0.804 | 17549 |
| VOCs | 0.796 | 56195 |
| contaminant | 0.795 | 45441 |
| dioxide | 0.791 | 10273 |
| gases | 0.789 | 11662 |
| gasses | 0.779 | 45276 |
| PM2 | 0.777 | 89917 |
| nitrogen | 0.775 | 12237 |
| adsorption | 0.774 | 61899 |
| ammonia | 0.767 | 21773 |
| SO2 | 0.765 | 90224 |
| gaseous | 0.762 | 42339 |
| sulfide | 0.760 | 49224 |
| particles | 0.760 | 7018 |
| sulfur | 0.758 | 22001 |
| PAHs | 0.757 | 93057 |
| ozone | 0.750 | 18222 |
| aerosols | 0.750 | 54502 |
| benzene | 0.743 | 46443 |
| chlorine | 0.742 | 17545 |