Potential sources of clinically significant exposure to diesel exhaust
| Roads and highways |
| Truck stops or distribution points |
| Construction sites |
| Railway depots or proximity to trains |
| City streets near bus and truck routes |
| Gas stations |
| Vehicle repair and maintenance shops |
| Tunnels |
| Toll stations |
| Bridges |
| Parking structures, garages, or lots |
| Fire stations |
| Airports |
| Bus stations |
| Boat harbors and docks |
| Mines |