| Acronym | Meaning |
| MACS | Modified Atomic Charge Superposition (in Calcns. On Atom-surface Scattering Potentials) |
| TOPO | Trioctylphosphine Oxide |
| SAE | Society Of Automotive Engineers |
| ILAS | Improved Limb Atmospheric Spectrometer |
| ICAP | Inductively Coupled Argon Plasma |
| CHAOS | Canadian High Acceptance Orbit Spectrometer |
| PEF | Peak Expiratory Flow |
| CTM | Chemical Transport Model |
| EMIT | Enzyme-multiplied Immunoassay Technique |
| CAM | Crassulacean Acid Metabolism (photosynthetic Pathway) |