| Abbreviation | Definition |
|---|---|
| MPCA | Minnesota Pollution Control Agency |
| MPCA | MN Pollution Control Agency |
| MPCB | Maharashtra Pollution Control Board |
| MPCD | Marine Pollution Control Device |
| MPCO | Makati Pollution Control Office |
| MPE | Maximum Permissible Exposure |
| MPEA | Middle Patuxent Environmental Area |
| MPEC | Mountain Park Environmental Center |
| MPRS | Marine Pollution Response Service |
| MPSR | Marine Pollution Surveillance Report |
| MRAI | Metal Recycling Association of India |
| MRAI | Metals Recycling Association of India |
| MRAP | Minnesota River Assessment Project |
| MRC | Mattress Recycling Council |
| MRC | Midwest Recycling Center |
| MRCA | Mattagami Region Conservation Authority [Ontario, Canada] |
| M-RETS | Midwest Renewable Energy Tracking System |
| MRF | Materials Recycling Facility |
| MRF | Municipal Recycling Facility |
| MRIP | Mississippi Reforestation Investment Program |