| 1 | The odor of hot pavement and auto exhaust blew into thecar. | |
| 2 | He looked back to see the hydrocarbon count registering from the exhaust sniffer. | |
| 3 | Many previous studies have measured carbon dioxide levels that come out of exhaust pipes. | |
| 4 | Motor vehicle exhaust also creates significant amounts of nitrates and other particles. | |
| 5 | On Earth, polycyclic aromatic hydrocarbons are found on burnt toast and in automobile exhaust. |