| PM 10 | PM10: Tiny Particles, Big Impacts on En… | Air Quality Manag… |
| PM-100 | PM-100: A Powerful Tool for Environment… | Water Purification |
| PM 15 | PM15: The Often Overlooked Threat in Ai… | Air Quality Manag… |
| PM 2.5 | PM 2.5: Tiny Particles, Big Problem Ai… | Air Quality Manag… |
| PMD | PMD: An Essential Tool in Environmental… | Wastewater Treatm… |
| PMR | PMR: A Key Metric for Environmental & W… | Wastewater Treatm… |
| PNA | PNA in Environmental & Water Treatment:… | Environmental Hea… |
| pneumoconiosis | The Silent Killer: Pneumoconiosis and I… | Environmental Hea… |
| POC | Understanding "POC" in Waste Management… | Waste Management |
| Pocket Pal | Pocket Pal: Your On-the-Go Solution for… | Waste Management |
| pocosin | Pocosins: Unlikely Allies in Waste Mana… | Wastewater Treatm… |
| PODR | The Point of Diminishing Returns in Env… | Environmental Hea… |
| POE | Point-of-Entry (POE): A Key to Clean Wa… | Water Purification |
| pogonip | Pogonip: A Cold Embrace in the Mountain… | Water Purification |
| pOH | Understanding pOH: A Key to Water Quali… | Water Quality Mon… |
| POHC | POHC: The Key Player in Environmental C… | Environmental Hea… |
| point-of-entry (POE) | Point-of-Entry (POE) Water Treatment: P… | Water Purification |
| point-of-use (POU) | Point-of-Use (POU) Water Treatment: Bri… | Water Purification |
| point source discharge (PS) | Point Source Discharges: A Focused Appr… | Environmental Pol… |
| polar zone | The Polar Zone: A Unique Challenge for … | Sustainable Water… |
