| Acronym | Meaning |
| NCAC | Nitrogen-containing Aromatic Compound |
| WLA | Waste Load Allocation |
| ETB | Extended Tight-binding (method For Electronic-structure Calcns.) |
| CIAC | Centro De Informacion Ambiental Del Caribe |
| OBS-MCSC | Optimized Basis Set-multiconfiguration Spin Coupled |
| ADAS | Acid Deposition Assessment Staff |
| SNO | Sudbury Neutrino Observatory |
| SERHF | Symmetry-equivalenced Restricted Hartree-Fock |
| TAP | Toxic Air Pollutant |
| CGA | Chromogranin A |