| Answer | Crossword Clue |
|---|---|
| ODOR | It's missing from carbon monoxide |
| ALARM | Sound from a carbon monoxide detector |
| EMISSION | Carbon monoxide from an engine, e.g. |
| methanation | the production of methane esp from carbon monoxide and hydrogen |
| methanations | METHANATION, the production of methane esp from carbon monoxide and hydrogen |
| BRA | It's missing from a monokini |
