| Similarity | Rank | |
|---|---|---|
| Radon | 0.861 | 60232 |
| monoxide | 0.770 | 23477 |
| VOCs | 0.767 | 56195 |
| ozone | 0.745 | 18222 |
| Monoxide | 0.713 | 90956 |
| IAQ | 0.710 | 93590 |
| contaminant | 0.708 | 45441 |
| contaminants | 0.700 | 17549 |
| particulates | 0.697 | 55487 |
| pollutants | 0.697 | 16074 |
| mercury | 0.686 | 12016 |
| radioactivity | 0.685 | 42842 |
| flue | 0.680 | 38443 |
| ionization | 0.676 | 60226 |
| crawlspace | 0.676 | 81731 |
| gases | 0.671 | 11662 |
| arsenic | 0.670 | 26971 |
| toxics | 0.669 | 88988 |
| pollutant | 0.666 | 41997 |
| TCE | 0.663 | 83931 |
| CO | 0.663 | 11074 |
| benzene | 0.662 | 46443 |
| sulfide | 0.660 | 49224 |
| radioactive | 0.656 | 15026 |
| dioxins | 0.656 | 77636 |