| chemical | 13 |
| gas | 10 |
| carbon monoxide | 5 |
| the air | 0.42 |
| the background | 0.30 |
| confusion | 0.16 |
| go up the chimney | 0.60 |
| irritate lung | 0.56 |
| fill the room | 0.55 |
| rise up the chimney | 0.54 |
| get thicker | 0.53 |
| fill the air | 0.51 |
| enter the chamber | 0.51 |
| become more intense | 0.47 |
| become thick | 0.46 |
| fill the sky | 0.46 |
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| disruption | 0.40 |
| odor | 0.40 |
| extensive corrosion | 0.32 |
| discoloration | 0.32 |
| asthma | 0.31 |
| irritation | 0.28 |
| etching | 0.28 |
| volatile | 0.27 |
| skin | 0.27 |
| eye | 0.24 |
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| an alchemist’s bomb | 0.27 |
| carbon monoxide | 0.59 |
| carbon dioxide | 0.53 |
| carbon | 0.51 |
| carcinogen | 0.50 |
| particulate matter | 0.50 |
| soot | 0.48 |
| formaldehyde | 0.45 |
| gas | 0.42 |
| toxin | 0.40 |
| protective and cleansin… | 0.38 |
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| purification | 0.25 |
| detected | 0.68 |
| removed | 0.61 |
| produced by fire | 0.57 |
| released | 0.55 |
| installed in accordance | 0.50 |
| taken into account | 0.48 |
| concerned | 0.45 |
| visited by millions of … | 0.42 |
| inhaled into lung | 0.41 |
| consumed | 0.41 |
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| divination | 0.36 |
| cleansing | 0.32 |