| Acronym | Meaning |
| PM | Particulate Matter |
| MED | Minimal Erythema Dose |
| CMAS | Completely Mixed Activated Sludge |
| FDSO | Full Diagonal Second-order (approxn. To)-green Function |
| FTS | Fourier Transform Spectroscopy |
| MASERATI | Middle Atmosphere Spectrometric Experiment On Rockets For Analysis Of Trace Gas Influences |
| USPC | Unoccupied-states Potential Correction |
| TAS | Total Analysis Systems |
| OA | Office Of The Administrator |
| MCDF | Multi-configuration Dirac-Fock |