| Clue | Source | Date |
|---|---|---|
| Stuffiness that lingers in an unventilated room | New York Times | 08 Aug 2022 |
| Sign of poor ventilation | Universal | 26 Dec 2021 |
| Stuffy atmosphere | New York Times | 04 May 2021 |
| Reason to use a room freshener | Premier Sunday | 29 Oct 2017 |
| Result of poor ventilation | The Washington Post | 29 Apr 2017 |
| Result of poor ventilation | LA Times Daily | 29 Apr 2017 |
| Result of poor ventilation | New York Times | 18 Apr 2017 |
| Result of poor ventilation | ||
| Result of poor ventilation | ||
| Result of poor ventilation | ||
| Result of poor ventilation |