| Acronym | Meaning |
| IMPROVE | Interagency Monitoring For Protected Visual Environments |
| OIP | Optimized Inner Projection (method For Mol. Property Calcns.) |
| LDT | Light Duty Truck |
| DDIM | Dry Deposition Inferential Monitoring |
| CHMOS | Complementary High-performance Metal-oxide Semiconductor |
| OBD | Optical Beam Deflection |
| MPI | Modified Perturbation Iteration |
| EF | Emission Factor |
| OPANA | Operational Version Of The Atm. Mesoscale Numerical Pollution Model |
| PLT | Lead Lanthanum Titanate |