| Clue | Source | Date |
|---|---|---|
| Designed to clear the air | USA Today | 30 Oct 2025 |
| Able to remove atmospheric pollutants | The Telegraph Cross Atlantic | 03 Jun 2025 |
| Designed to reduce urban pollution | Newsday | 31 Jul 2024 |
| Designed to clear the air | New York Times | 19 Jun 2016 |
| Designed to clear the air | ||
| Promoting clean air |