| Acronym | Meaning |
| SCLO | Self-consistent Local Orbital |
| MSIS | Mass Spectrometer And Incoherent Scatter |
| TRIM | Total Risk Integrated Methodology |
| OBK | Oppenheimer-Brinkman-Kramers (approxn. In Atom-ion Electron-exchange Calcns.) |
| CDW-EIS | Continuum Distorted Wave-eikonal Initial State (in Collisions) |
| STAPPA | State And Territorial Air Pollution Program Administrators |
| AAEE | American Academy Of Environmental Engineers |
| PARS | Photoacoustic Raman Spectroscopy |
| GANC | Generalized Acid Neutralization Capacity Test |
| HLR | Hydraulic Loading Rate |