| Acronym | Meaning |
| APHEA2 | Air Pollution And Health: A European Approach 2 |
| CASS | Cyclic Activated Sludge System |
| SMR | Standardized Mortality Ratios |
| SEP | Solar Energetic Particle (event) |
| IRLG | Interagency Regulatory Liaison Group |
| CHC | Chlorinated Hydrocarbon |
| NEWWA | New England Water Works Association |
| VBCI | Valence Bond Configuration Interaction |
| FDA | Food And Drug Administration |
| IMPPT | Interaction Moeller-Plesset Perturbation Theory |