| Acronym | Meaning |
| UAM-IV | Urban Airshed Model Version IV |
| LOGD | Limit Of Guaranteed Detection |
| CSD | Charge State Distribution |
| HMW | High Molecular Weight |
| IGCC | Integrated Gasification Combined Cycles (electric Power Generation Technology) |
| GRGL | Groundwater Residue Guidance Level |
| TSPA | Total System Performance Assessment |
| LAICP | Laser Ablation Inductively Coupled Plasma |
| FMO | Frontier Molecular Orbital |
| SO | Stieltjes Orbitals (for Mol. Photoionization Continua) |