| Acronym | Meaning |
| PVO | Pseudovalence Orbital |
| NAA | Nonattainment Area |
| HCDW | Hydrogenic Continuum Distorted Wave (a Wave Function In Calcns. On Atomic And Molecular Collisions) |
| DIOA | Diisooctyl Adipate |
| NMFS | National Marine Fisheries Service (of NOAA) |
| BERG | Building Effects Review Group |
| THM | Traveling Heater Method |
| TACI | Transmembrane Activator And CAML Interactor |
| PSI | Pollution Standard Index |
| ARDS | Adult Respiratory Distress Syndrome |