| Acronym | Meaning |
| HAL | Health Advisory Level |
| BSA | Breathing-sphere Approxn. (for Inelastic Mol. Collisions) |
| QCCA | Quasiclassical Close-coupling Approximation |
| KPNO | Kitt Peak National Observatory |
| SEE | Space Environment And Effects |
| SEMC | Scaled Ensemble Monte Carlo |
| LAMBD | Laser Assisted Molecular Beam Deposition |
| TMDL | Total Maximum Daily Load |
| MAGICC | Model For The Assessment Of Greenhouse-gas Induced Climate Change |
| ISPM | In-situ Particle Monitor |