| Clue | Source | Date |
|---|---|---|
| Auto emissions evaluation | Premier Sunday | 25 May 2025 |
| Car emissions check | LA Times Daily | 13 Oct 2024 |
| Exhaust-ive check? | LA Times Daily | 05 Oct 2023 |
| Certain vehicle emissions exam | Universal | 26 Mar 2023 |
| Exhaustive analysis? | LA Times Daily | 11 Feb 2023 |
| Requirement that hybrid cars may be exempted from | New York Times | 05 Sep 2015 |
| Requirement that hybrid cars may be exempted from |