| Acronym | Meaning |
| RECLAIM | Regional Clean Air Incentives Market |
| ACAMS | Automatic Continuous Air Monitoring System |
| NEIC | National Enforcement Investigations Center |
| GFC | Gel Filtration Chromatography |
| LTE | Local Thermodn. Equil. |
| L2 | Square Integrable (wave Function) (in Electron-atom Or -mol. Collisions) |
| G2 | Gaussian-two (an Ab Initio Mo Theory For Mol. Energies Calcn.) |
| UARS | Upper Atmosphere Research Satellite |
| SDOSS | Sodium Dioctylsulfosuccinate |
| RSMST | Real-space Multiple-scattering Theory (in Electronic Structure) |