| Abbreviation | Definition |
|---|---|
| OSGV | Open Source Green Vehicle |
| OSPM | Operational Street Pollution Model |
| OSR | Oil Spill Response |
| OTIS | Oil Tank Inspection System |
| OVL | Oily Viscous Liquid |
| OWEB | Oregon Watershed Enhancement Board |
| OWLS | Outdoor Wildlife Learning Site |
| OWMS | Oily Wastewater Management Study |
| OWRR | Office of Waste Reduction and Recycling |
| OWST | Organic Waste Storage Tank |
| P | Pollution |
| P1P | Phase 1 Plant |
| PAEI | Public Access to Environmental Information |
| PALS | Pond And Lake Stewards |
| PAS | Percussive Arts Society |
| PASS | Portable Air Safety System |
| PBBC | People Building Better Cities |
| PBM | Prescribed Burn Monitoring |
| PBP | Polychlorinated Biphenyls Program |
| PBP | Prescribed Burn Project |