| Acronym | Meaning |
| XD | Exothermic Dispersion |
| MCL | Maximum Contaminant Level |
| IWG | International Working Group |
| AO | Atomic Orbital |
| DNC | Delayed Neutron Counting |
| EPT | Exponential Perturbation Theory |
| SPOT | Satellite Pour L'Observation De La Terre |
| OES | Optical Emission Spectroscopy |
| VICAR | Visual Colorimeter For Atmospheric Research |
| ARIAP | Acid Rain Impact Assessment Program |