| Acronym | Meaning |
| TIA | Transient Ischemic Attack |
| GRWA | Generalized Rotating-wave Approxn. (in Energy Level Calcns.) |
| LST | Local Solar Time |
| NQI | Nuclear Quadrupole Interaction |
| LEMA | Least Error Matrix Analysis |
| ORV | Optical Retardation Velocity |
| IRES | Infrared Emission Spectroscopy |
| T-GAS | Trace Gas Accounting System |
| EFPVN | Eastern Fine Particle And Visibility Network |
| NIWG | National Interagency Work Group |