| Acronym | Meaning |
| TOA | Thermooptical Analysis |
| SS-CCSD | State Selective-CCSD |
| MCR | Mutual Climate Range |
| HEAL | Human Exposure Assessment Location |
| AIRDAS | Airborne Infrared Disaster Assessment System |
| IOS | Infinite Order Sudden Approximation |
| FP-LMTO | Full-potential Linear Combination Of Muffin-tin Orbitals |
| EMTB | Effective-medium Tight-binding |
| APIOS | Acid Precipitation In Ontario Study |
| CRMMA | Chemical Reference Material Manufacturers Association |