| carbon monoxide → AtLocation → the air | 0.35 | |
| carbon monoxide → AtLocation → furnace | 0.27 | |
| carbon monoxide → AtLocation → cigarette smoke | 0.25 | |
| carbon monoxide → AtLocation → car exhaust | 0.20 | |
| carbon monoxide → AtLocation → combustion fumes | 0.20 | |
| carbon monoxide → AtLocation → fume | 0.16 | |
| carbon monoxide → AtLocation → tobacco | 0.16 |